Originally Posted by usmanamjad87

First of all u dont need to hav commerce background for knowing stock exchange
In simple words stock market is a market where stocks i.e. shares of corporations are sold and bought. Brokers are the agents which buy and sell those shares for investors, means middle man. Directly one cant trade in market.
Market collapse means fall down of market i.e. sudden fall of rates due to many reasons. Few of them r stated in above message. Few others include, company decisions, their profits, losses, announcements, collations, political situation, oill prices, means every factor related to money directly or indirectly affects stock market, and market collapses if any major event occur.