Investment funds are like big piggy banks that collect money from people and use it to make more money by investing in different things. There are two main types: open funds and closed funds. Open funds can change how many owners they have and how much they're worth, while closed funds have a set number of shares that are sold at the beginning. Financial companies help people invest their money in the stock market and other things. They are like a one-stop shop for different investment funds. These companies buy and sell shares, bonds, and other investments to make money for their clients. The goal of these companies is to make sure they are organized well enough to help people invest their money wisely.