It should not be mistaken with closed-end fund. The closed-end funds do not create new shares. They have fixed amount of shares. They are listed on the exchanges and you can trade them like stocks. Because of that they are often referred as exchange-traded funds.
Stock funds invest mainly in stocks.
The funds that invest larger percentage of their assets in stocks are more aggressive. Each of the main groups one can divide into tens of sub-groups. We are going to limit ourselves into drafting couple of sub-groups, thus giving you the general knowledge about types of funds. Presently there is over 10,000 mutual funds on the market and new funds are created constantly. Among stock funds one can distinguish diversified funds and focused funds.