Funds that invest in stocks represent the largest category of mutual funds. Generally, the investment objective of this class of funds is long-term capital growth with some income. There are, however, many different types of equity funds because there are many different types of equities. A great way to understand the universe of equity funds is to use a style box.
The idea is to classify funds based on both the size of the companies invested in and the investment style of the manager. The term value refers to a style of investing that looks for high quality companies that are out of favor with the market. These companies are characterized by low P/E and price-to-book ratios and high dividend yields. The opposite of value is growth, which refers to companies that have had (and are expected to continue to have) strong growth in earnings, sales and cash flow. A compromise between value and growth is blend, which simply refers to companies that are neither value nor growth stocks and are classified as being somewhere in the middle.
For example, a mutual fund that invests in large-cap companies that are in strong financial shape but have recently seen their share prices fall would be placed in the upper left quadrant of the style box (large and value). The opposite of this would be a fund that invests in startup technology companies with excellent growth prospects. Such a mutual fund would reside in the bottom right quadrant (small and growth).