The fields of law in the United States break into roughly a dozen major practice areas: criminal law, civil litigation and torts, family law, probate and estates, corporate and business law, intellectual property, employment law, immigration law, administrative law, and constitutional and civil rights law. Each one has its own courts or agencies, its own rules, and its own kind of attorney. Picking the wrong type of lawyer for a problem is one of the more expensive mistakes people make, so it helps to know what sits inside each field before you start looking for help or deciding where to focus a career.
Criminal Law
Criminal law deals with conduct the government has decided to punish rather than leave to a private lawsuit. Prosecutors bring charges on behalf of the state or federal government. Defense attorneys represent the accused, and they’re ethically bound to advocate for their client regardless of personal opinion about guilt.
Crimes fall into two tiers. Felonies carry potential prison sentences of more than one year and can include fines reaching tens of thousands of dollars or more, depending on the jurisdiction and offense class. Misdemeanors are less severe, with jail time capped at one year or less. The dollar thresholds that separate a misdemeanor theft from a felony theft vary widely, from a few hundred dollars in some states to $2,500 in others. The difference matters well beyond the sentence itself: a felony conviction affects employment, housing, and voting rights in ways a misdemeanor typically does not.
White-collar crime is the non-violent financial subset — fraud, embezzlement, insider trading. Federal mail fraud alone carries up to 20 years in prison, and up to 30 years if the scheme targets a financial institution.1Office of the Law Revision Counsel. 18 USC 1341 – Frauds and Swindles Federal securities fraud can bring up to 25 years.2Office of the Law Revision Counsel. 18 USC 1348 – Securities and Commodities Fraud Federal sentencing is also structured: the U.S. Sentencing Commission publishes a table that pairs an offense level (1 to 43) with a criminal history category (I to VI) to produce a recommended prison range in months, which judges use as the starting point in most federal cases.3United States Sentencing Commission. Sentencing Table – 2025 Guidelines Manual
Civil Litigation and Tort Law
Civil law handles disputes between private parties — individuals, families, or businesses — rather than prosecutions by the government. Tort law is the most visible slice: one party claims another’s conduct caused them harm. Negligence is the workhorse theory. If someone fails to exercise reasonable care and that failure causes an injury, the injured person can sue for compensation. Car accidents, slip-and-fall cases, and medical malpractice all run through negligence analysis.
Plaintiffs in personal injury cases typically seek damages for medical expenses, lost income, and pain and suffering. Most personal injury attorneys work on contingency, collecting a percentage of whatever the client recovers (usually around a third) and nothing if the case loses. That arrangement makes legal representation accessible to people who couldn’t otherwise afford it.
Beyond compensatory damages, courts can award punitive damages to punish especially bad conduct. The U.S. Supreme Court has placed constitutional limits on these awards. In State Farm v. Campbell, the Court held that punitive damages generally should not exceed a single-digit ratio to the compensatory damages, so a $100,000 compensatory award will struggle to support a punitive award much beyond $900,000.4Justia US Supreme Court. State Farm Mut. Automobile Ins. Co. v. Campbell, 538 US 408 (2003) When the compensatory award is already substantial, even lower ratios may be the ceiling. A defendant’s wealth alone cannot justify an otherwise excessive award.
Family Law
Family law covers the legal side of domestic relationships: divorce, child custody, spousal support, and adoption. Divorce proceedings require dividing assets and debts. Most states use either community property rules (roughly a 50/50 split of marital property) or equitable distribution (a fair but not necessarily equal split based on factors like income disparity and length of the marriage). Child support amounts follow standardized guidelines in every state, factoring in each parent’s income and the child’s specific needs. Custody disputes can become the most emotionally charged proceedings in any courthouse.
Probate and Estates
Probate law handles the administration of a deceased person’s estate. When someone dies with a valid will, the probate court confirms the document’s authenticity, appoints an executor, and oversees payment of debts and distribution of assets to the named beneficiaries. When someone dies without a will, state intestacy laws dictate who inherits, typically a surviving spouse and children, in proportions that vary by jurisdiction.
Probate can wrap up in six months for a simple estate or drag on for two years or more when assets are complex or beneficiaries challenge the will. That timeline is one of the main reasons people use trusts and other estate planning tools to bypass probate entirely.
Corporate and Business Law
Corporate lawyers guide businesses through formation, daily operations, and major transactions. The work starts with entity selection — choosing between a corporation, limited liability company, partnership, or another structure — and filing the required formation documents with the state. Each structure carries different implications for personal liability, taxation, and management flexibility. Proper structuring shields the owner’s personal assets from company debts, which is the single most important reason to form a separate entity rather than operate as a sole proprietor.
Day-to-day corporate practice involves drafting and reviewing contracts that define the rights and obligations of partners, shareholders, employees, and vendors. Business attorneys also advise boards of directors on their fiduciary duties, the legal obligation to act in the best interest of shareholders rather than personal gain. Getting governance wrong can expose individual directors to personal liability, which is why even small companies benefit from clear operating agreements and bylaws.
Mergers, Acquisitions, and Securities
Mergers and acquisitions are some of the most complex work in corporate law. Lawyers conduct due diligence into the target company’s finances, contracts, litigation exposure, and regulatory compliance before a deal closes. Publicly traded companies face additional obligations, including filing annual 10-K reports with the Securities and Exchange Commission. Federal antitrust law adds another layer: transactions valued above $133.9 million in 2026 require pre-merger notification to the Federal Trade Commission and the Department of Justice, with a mandatory waiting period before closing.5Federal Trade Commission. Current Thresholds Deals exceeding $535.5 million are reportable regardless of the parties’ size.
Intellectual Property
Intellectual property law protects creations of the mind: inventions, brand names, creative works, and trade secrets. The three main forms of federal IP protection are trademarks (brand identifiers like names and logos), patents (inventions), and copyrights (original creative works). The U.S. Patent and Trademark Office handles trademarks and patents, while the U.S. Copyright Office at the Library of Congress handles copyright registration.6United States Patent and Trademark Office. Trademark, Patent, or Copyright
Nondisclosure agreements and non-compete clauses add contractual protection for proprietary business information, though enforceability of non-competes varies significantly across states, with some banning them outright for most workers.
Employment Law
Employment law governs the relationship between employers and workers, from hiring to termination. Federal wage-and-hour rules set the floor: the Fair Labor Standards Act requires overtime pay for non-exempt employees who work more than 40 hours per week. To qualify for the “white-collar” exemption from overtime, an employee must be salaried, earn at least $684 per week ($35,568 per year), and perform executive, administrative, or professional duties.7U.S. Department of Labor. Earnings Thresholds for the Executive, Administrative, and Professional Exemption Several states set their own thresholds significantly higher than the federal minimum, so the applicable standard depends on where the employee works.
Discrimination claims form the other major pillar. Federal statutes prohibit workplace discrimination based on race, sex, religion, national origin, age, disability, and several other protected characteristics. Employees who believe they’ve been discriminated against typically must file a charge with the Equal Employment Opportunity Commission before they can sue in court, a procedural step that catches many people off guard. Wrongful termination, harassment, and retaliation cases also fall within this practice area. Some employment lawyers advocate for employees; others counsel businesses on compliance and defend against claims.
Immigration Law
Immigration law controls who can enter, live, and work in the United States. The field breaks into two tracks. Affirmative work covers visas, green cards, and naturalization. Defensive work covers deportation defense and asylum claims. The paperwork on the affirmative side is notoriously precise, and small errors in form preparation can cause months of delay or outright denial.
Defensive practice happens before immigration courts, which are overseen by the Executive Office for Immigration Review within the Department of Justice. More than 500 immigration judges operate across over 60 locations nationwide.8Department of Justice. Learn About the Immigration Court Proceedings begin when the Department of Homeland Security files a Notice to Appear, and the immigration judge then determines whether the individual is removable and eligible for any form of relief. Either side can appeal to the Board of Immigration Appeals.
One important boundary: unlike criminal court, there is no constitutional right to a government-provided attorney in immigration proceedings. Respondents either hire counsel out of pocket or appear without representation, a gap that significantly affects outcomes.
Administrative and Constitutional Law
Administrative law governs the actions of government agencies — the EPA, SSA, FCC, and dozens of others at the federal level, plus their state counterparts. These agencies receive their authority from legislation and then write detailed regulations to implement broad statutory goals. The Administrative Procedure Act sets the ground rules for how federal agencies must operate, including requirements that parties receive timely notice of hearings and a meaningful opportunity to present evidence.9Office of the Law Revision Counsel. 5 USC 554 – Adjudications Courts can set aside agency action that is “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law,”10Office of the Law Revision Counsel. 5 USC 706 – Scope of Review though in practice courts give agencies significant deference, and individuals generally must exhaust the agency’s internal appeals before heading to court.
Constitutional and civil rights law is a related public-law field focused on the interpretation of the Constitution and the protection of individual rights against government overreach. The federal civil rights statute allows individuals to sue state and local government officials who violate their constitutional rights while acting in their official capacity.11Office of the Law Revision Counsel. 42 USC 1983 – Civil Action for Deprivation of Rights These suits cover everything from excessive force by police to due process violations in government benefit decisions.
Ethical Rules That Apply Across Every Field
Every licensed attorney, in every field above, operates under ethical rules. Two sit at the core. First, confidentiality: a lawyer cannot reveal information related to a client’s representation unless the client consents, except in narrow circumstances like preventing death, serious physical harm, or certain financial crimes where the lawyer’s services were used to further the fraud.12American Bar Association. Rule 1.6 – Confidentiality of Information This duty survives after the attorney-client relationship ends.
Second, conflicts of interest: a lawyer generally cannot represent one client whose interests are directly adverse to another current client, or where the representation of one client would be materially limited by obligations to someone else. Conflicts can sometimes be resolved through informed, written consent from all affected clients, but only if the lawyer reasonably believes they can still provide competent representation to everyone involved.13American Bar Association. Rule 1.7 – Conflict of Interest: Current Clients Violations can lead to suspension, disbarment, or malpractice liability.
How Lawyers Get Into Any of These Fields
The path into any of these practice areas follows the same rigid sequence. You need a four-year undergraduate degree in any subject, followed by a three-year Juris Doctor program at an accredited law school. Admission requires the Law School Admission Test, scored on a scale from 120 to 180.14Law School Admission Council. LSAT Scoring The first year is foundational — contracts, torts, civil procedure, property, criminal law, and legal writing — and students pick electives and clinical experiences in their second and third years, which is where specialization in a field like IP, immigration, or corporate work usually begins.
After the J.D., graduates must pass the bar examination in the state where they intend to practice. Most states now use the Uniform Bar Examination, which produces a portable score that some jurisdictions accept from other states. Passing the bar isn’t the final step. Applicants also undergo a character and fitness evaluation, where the licensing authority investigates their background for issues like criminal history, financial irresponsibility, or dishonesty. That review can take months and occasionally derails candidates who assumed the bar exam was the only hurdle. Once licensed, attorneys must complete continuing legal education throughout their careers to keep their credentials active.