The American Bar Association (ABA) is a voluntary bar association of lawyers and law students; it is not specific to any jurisdiction in the United States. Founded in 1878, the ABA's stated activities are the setting of academic standards for law schools, and the formulation of model ethical codes related to the legal profession. As of fiscal year 2017, the ABA had 194,000 dues-paying members, constituting approximately 14.4% of American attorneys. In 1979, half of all lawyers in the U.S. were members of the ABA. The organization's national headquarters are in Chicago, Illinois, and it also maintains a significant branch office in Washington, D.C.

A lawyer is a person who practices law. The role of a lawyer varies greatly, across different legal jurisdictions. A lawyer can be classified as an advocate, attorney, barrister, canon lawyer, civil law notary, counsel, solicitor, legal executive, and public servant. — with each role having different functions and privileges. Working as a lawyer generally involves the practical application of abstract legal theories and knowledge to solve specific problems. Some lawyers also work primarily in advancing the interests of the law and legal profession.