Mutual funds provide a way for investors to achieve diversification and professional management of their investments. They pool money from individual investors and invest it in a variety of securities like stocks, bonds and money market instruments. This allows even small investors to hold a diversified portfolio. Mutual funds offer various advantages like liquidity, convenience and transparency. However, they also charge fees and expenses and do not allow as much control over investments as direct investing. There are different types of mutual funds categorized by whether they invest in stocks, bonds or money market instruments as well as by their investment objectives like growth, income or capital preservation.