Stock Market is the place where the share of a particular listed company are traded between buyers and seller.
Primary Markets-Raising capital from public directly via advertising
Secondary markets-Raising capitals/investment from public via exchange of stocks Eg Stock Markets.SENSEX and NIFTY are Indices for Indian Stock Market
Initial Public offer is the selling of securities to the public.When an unlisted company makes either fresh issue of securities or an offer for sale of its existing securities
Investments are usually done on a longer time frame whereas Trading is done for a relatively shorter time period
Eg : You choose a stock and identify it has a potential to price rise and hold on fora year or so , then it becomes investment.
An example for Trading is Intraday trading where you buy and sell the stock on same day for a reasonable amount of profit/loss