Law is a system of rules created and enforced through social or governmental institutions to regulate behavior. Law can be created by a collective legislature, resulting in statutes, or by the executive through decrees and regulations, or by judges through precedent in common law jurisdictions.
Law shapes politics, economics, history and society in many ways and acts as a mediator of relations between people. It has been described as a science and an art.
A lawyer is a person who studies and practices law. The word is also used as a general term for any set of legal rules, and the department of knowledge concerned with these rules is known as jurisprudence.
A judge is a person who sits in court and decides cases. In the United States, judges are appointed by the president and confirmed by the Senate. A judge can be removed from office for a number of reasons, including ethical misconduct or incompetence. The decision of a judge can be appealed.
Generally, laws are written in a clear and straightforward manner so that they can be understood by the average person. However, the laws of the universe are complex and their precise definition is a subject of ongoing debate. For example, it is impossible to empirically verify whether a given law comprises precepts of such import as, for instance, the laws of gravity or the laws of thermodynamics. Also, any law is bound by the physical shape of the world and cannot mandate behaviours that are unattainable or force people to do things beyond their abilities.