In financial markets, a share is a unit of account for various investments. It often means the stock of a corporation, but is also used for collective investments such as mutual funds, limited partnerships, and real estate investment trusts.
Corporations issue shares which are offered for sale to raise share capital. The owner of shares in the corporation is a shareholder (or stockholder) of the corporation. A share is an indivisible unit of capital, expressing the ownership relationship between the company and the shareholder. The denominated value of a share is its face value, and the total of the face value of issued shares represent the capital of a company, which may not reflect the market value of those shares.
The income received from the ownership of shares is a dividend. The process of purchasing and selling shares often involves going through a stockbroker as a middle man.
Shares are valued according to various principles in different markets, but a basic premise is that a share is worth the price at which a transaction would be likely to occur were the shares to be sold. The liquidity of markets is a major consideration as to whether a share is able to be sold at any given time. An actual sale transaction of shares between buyer and seller is usually considered to provide the best prima facie market indicator as to the "true value" of shares at that particular time.