In law, the bar refers to the legal profession. The term originated from the physical bar in a courtroom separating lawyers from spectators. Lawyers had to be "called to the bar" to participate. Today, bar associations regulate lawyer licensing and conduct. Becoming a lawyer involves passing the bar exam.
Bar associations advocate for lawyers and provide resources. The American Bar Association is the largest lawyer association. Being "called to the bar" means being allowed to practice law after passing the bar exam. An attorney is licensed to practice law after passing the bar. Law school typically takes 3 years.