Some investors prefer growth funds that offer capital appreciation over the medium to long- term. Such schemes invariably invest bulk of their corpus in equities and thus the risk factor is more.
In order to receive regular and steady income, majority of investors opt for income funds schemes. Such schemes generally invest in fixed income securities such as bonds, debentures issued by corporations and securities insured by Government.
Money market funds or Inter-Bank Call Money Market funds are popular because of easy liquidity, safety of original investment and reasonable income. These schemes utilize the corpus funds by investing in short-term instruments. Treasury Bills and several short term commercial papers come under this category.
If you refer to individual preferences or look at the options provided by the issuing companies, you will certainly get confused with so many types of funds available in the market. But primarily, you should categorize them under Equity, Debt and Balance, or, Closed-end and Open Mutual Funds.