SEBI was established in 1988 as a non-statutory body and later given statutory powers through the SEBI Act of 1992 to regulate and develop an orderly securities market, protect investors, and promote capital formation. It oversees stock exchanges, registers market intermediaries like brokers and investment advisors, prohibits unfair trading practices, and takes measures to promote investor education. SEBI's objectives are to protect investors, ensure fair practices, and promote transparency in the securities market.