Stock market is a vibrant place where buyer and sellers meet and transact
This is facilitated in India by two stock exchanges BSE and NSE
They inturn have depositories like NSDL and CDSL to assist in the documentation and recording
There are also many brokers eg., ICICI direct and Sharekhan who provide services for fees or brokerage
Other than shares, you can also trade Futures and Options, Commodities and currencies