A lawyer is a professional who is qualified to offer advice about the law or represent someone in legal matters. A lawyer can also be called an attorney, a solicitor, a counselor, a barrister, or — pejoratively — an ambulance chaser. A lawyer can handle all sorts of legal matters from drafting wills to patent claims to defending people against criminal charges. Qualified lawyers have to attend law school and pass a bar exam in order to practice law. Lawyer, of course, means one who practices the law.

Source: Vocabulary.com