The “stock” is a share in the ownership of a company. A stock represents a claim on the company's assets and earnings. As you acquire more stocks, your ownership stake in the company becomes greater.
A stock market or equity market is the aggregation of buyers and sellers, these are securities listed on a stock exchange as well as those only traded privately.Holding a company's stock means that you are one of the many owners (shareholders) of a company.
A stock is represented by a "stock certificate" this is a paper proof of your ownership. Now-a-days we can use a “Demat” account. Everything will be done though the computer electronically.
Stocks operate on the rule of Supply and Demand. As the high demand for a stock more people are interested in buying than selling, the price of the stock goes up. Stocks demand is depend upon the company performance.