Stock market is place where we buy/sell shares to make profit regulated by SEBI.
Brokers are licensed with SEBI to provide platform/interface for buyers/sellers to trade.
When company needs huge investment which cannot raised within their limits they offer IPO[primary market].If the share price goes beyond Company’s fixed price it gets listed profitable in IPO & rates goes high.
Index for NSE -NIFTY,BSE-SENSEX
Dividend-profit proportionately divided amongst share holders.
When share price goes up-we buy-termed as LONG
When share price goes down-you sell-termed as SHORT.
Buyers gets arranged in descending order of the quoted price
Sellers gets arranged in ascending order of the quoted price