According to wikipedia :- A bar association is a professional body of lawyers. Some bar associations are responsible for the regulation of the legal profession in their jurisdiction; others are professional organizations dedicated to serving their members; in many cases, they are both.
In many Commonwealth jurisdictions, the "bar association" comprises lawyers who are qualified as barristers or advocates (collectively known as "the bar", or "members of the bar"), while the "law society" comprises solicitors. These bodies are sometimes mutually exclusive. In other jurisdictions, the "bar" may refer to the entire community of persons engaged in the practice of law.
In India under the legal framework set established under the Advocates Act, 1961, a law graduate is required to be enrolled with the Bar Council of India. The process of enrollment is delegated by the Bar Council of India to the state Bar Councils wherein almost each state has a Bar Council of its own. Once enrolled with a State Bar Council, the law graduate is recognized as an Advocate and thereupon is entitled to appear and practice before any court in India. There is no formal requirement for further membership of any Bar Association. However Advocates do become members of various local or national bar associations for reasons of recognition and facilities which these associations offer. Besides the Bar Council of India, other known Bar Associations in India are "All India Bar Association" and "Supreme Court Bar Association". Each State and local court generally also has a Bar Association of its own, like the "Delhi High Court Bar Association" "Bombay High Court Bar Association" etc.