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A stock market, equity market, or share market is the aggregation of buyers and sellers of stocks (also called shares), which represent ownership claims on businesses; these may include securities listed on a public stock exchange as well as stock that is only traded privately, such as shares of private companies. 
company's market share is its sales measured as a percentage of an industry's total revenues. You can determine a company's market share by dividing its total sales or revenues by the industry's total sales over a fiscal period. Use this measure to get a general idea of the size of a company relative to the industry.
How do you actually buy shares of stock?
First, you'll need to open a brokerage account.
Next, you'll need to decide which stocks you'd like to buy.
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How can companies increase their market shareshare?