A share is a unit of ownership in an investment fund or company. In the case of investment funds, it represents a portion of the total assets of a fund that belongs to an investor. The value of a share fluctuates depending on the fund's performance and the value of its assets. In the case of company stocks, it represents an ownership stake in the company, giving the shareholder the right to participate in its profits (such as through dividends) and vote at annual general meetings.