When you fundraise, you ask people to contribute money. If your French club needs $3,000 for a trip to Montreal, every member will need to fundraise.
At Christmas time, you probably see people dressed as Santa Claus ringing bells on the sidewalk — they're there to fundraise for charities, hoping you'll put a few dollars in their bucket. Large organizations fundraise by throwing lavish parties and selling expensive tickets, and neighborhood kids might fundraise to buy a pet rabbit by setting up a lemonade stand. Funds are money, and when you raise them, you increase or grow them.