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.

An "advocate" is a professional in the field of law. Different countries and legal systems uses the term with somewhat differing meanings. The broad equivalent in many English law–based on jurisdictions could be a barrister or a solicitor. However, in Scottish, Manx, South African, Italian, French, Spanish, Portuguese, Scandinavian, Polish, Israeli, South Asian and South American jurisdictions, "advocate" indicates a lawyer of superior classification.