Criminal law, as distinguished from civil law, is a system of laws concerned with crimes and the punishment of individuals who commit crimes. Thus, where in a civil case two parties dispute their rights, a criminal prosecution involves the government deciding whether to punish an individual for either an act or an omission.
A “crime” is any act or omission in violation of a law prohibiting said action or omission.
Criminal Codes
Each state decides what conduct to designate a crime. As such, each state has its own criminal code. Congress has also chosen to punish certain conduct, codifying federal criminal law in Title 18 of the U.S. Code. Criminal laws vary significantly among the states and the federal government.

Family law, also referred to as domestic relations in many states, is the broad body of law that covers marriage, divorce, child custody, adoption, domestic violence, reproductive rights, and other matters regarding family relationships.
Much of family law originates in English common law traditions surrounding marriage and the family unit. However, modern family law has expanded far beyond its common law roots, and family law is governed mostly by state law which varies highly from state to state. Some states take a limited view of family law, but many states such as New York take a broad view that includes parts of criminal law like juvenile delinquency. Often, states establish separate family or domestic courts to address matters of family law.

Real estate law is the area of law that governs buying, using, and selling land.
It’s the law that governs how people acquire property and what they can do with the property that they own.
Real estate law is also called real property law.
Real estate law is called real estate because it’s about real property.
Real property is land as opposed to personal property, which is objects.
Fixtures that are permanently on the land, like buildings or other large structures, are also a part of real property.
There are many different aspects of real estate law, like deeds, titles, purchase financing, zoning, taxes, and estate planning. Lawyers who practice real estate law must know the state law that applies to their case.

United States labor law sets the rights and duties for employees, labor unions, and employers in the US.
Labor law's basic aim is to remedy the "inequality of bargaining power" between employees and employers, especially employers "organized in the corporate or other forms of ownership association".
Over the 20th century, federal law created minimum social and economic rights, and encouraged state laws to go beyond the minimum to favor employees.

In the US, healthcare law encompasses a broad range of regulations governing the healthcare industry, including patient rights, access to care, and the responsibilities of healthcare providers and insurers.
Key areas include the Affordable Care Act (ACA), medical malpractice law, and regulations related to public health and mental health.
HIPAA Privacy Rule. The HIPAA Privacy Rule protects personal health information and gives patients a variety of rights.

The CDA sets forth a comprehensive system for resolving disputes between a contractor and a procuring agency relating to the performance of most procurement contracts. The starting point for resolving disputes under this system is the submission of a formal claim seeking a contracting officer's final decision. The claims of both the contractor and the agency must be the subject of a contracting officer's final decision. A contractor dissatisfied with a contracting officer's final decision may appeal the decision.