dear miss
 although i m not a genius , but will try to inlighten u
 any co. who is doing a business have some capital( money for running the business) and as these co.s have their capital in large amounts . their capital is devided in smaller units of money i.e. of RS.10 or
Rs.100 . these small units are called the share.
the share is the smalles unit of their capital amount which is tradeable through stock market.
another word for stock is capital , so the stock mktt is a place where one can trade the smallest unit of
capital of any listed co. in share/stock mktt,
one can go for this business of stock mktt. through a stock broker . it can be now online too.
few banks like icici and hdfc r also doing this work.
with regards                                                                                                                                        ash