Answer:
share/single stock is a small piece of ownership in a company
Step-by-step explanation:
company ownership can come in various ways like partnership,buying of the company' stock in form of shares, buying over the company and inheritance is also one way of having/owning a company.
If an investor that intends to own a piece of a company without actually buying over the company from it's current owners he can buy the company stocks in small pieces called shares. the essence of buying stocks of a company is the intention of been a part owner of a company and enjoying dividends of your ownership when the prices of the stock bought appreciates.