Sustainable finance is when people use their money to help make the world a better place. It can happen in different ways, like investing in companies that are trying to make the environment cleaner, or putting money in banks that help people without a lot of money make their lives better. People may also give money to organizations that help protect nature, or do things like clean up water so it's safe for everyone to use. With sustainable finance, people can make sure that their money is used to make the world a better place.