Mutual fund is a financial instrument which pools the money of different people and invests them in different financial securities like stocks, bonds etc. Each investor in a mutual fund owns units of the fund, which represents a portion of the holdings of the mutual fund. Let us understand with the help of an example. Suppose you invest Rs 100,000 in a mutual fund. If the price of a unit of the fund is Rs 10, then the mutual fund house will allot you 10,000 units. Let us assume the total money invested in the fund by all the investors is Rs 100 crores. The mutual fund invests the money to buy stocks. Then each unit will represent 0.000001% of all the stocks the mutual fund has in its holdings. If you have 10,000 units, then your portion of the mutual fund stock holdings will be 0.01%. As the value of securities held by the mutual increases or decreases, so will the price of the units.