An insight into Online Stock & Share Trading. Stock trading and share markets are the two most commonly used terms that is associated in the Financial Domain. It is the only sector which employees a million people, both in India and overseas and is responsible for the financial future for many a millions. In most countries it is the stock market that determines its currency value and economy. On a global basis (as of latest updates from reliable sources) the size of the world stock market was estimated at about $36.6 trillion US Dollars.