Stock market is a place where shareholders buy and sell the shares like any other market like vegetable market various traders buy and sell vegetables etc., stock market is regulated by SEBI. Stock market has 2 major exchanges namely NSE and BSE.
we have primary market wherein IPOs are dealt and we have secondary market wherein buy and sell of shares happens after IPOs.
Promoter, shareholder, directors are different persons having different roles to play.
Investment refers to long term and trading refers to short term.