Tax havens are places where people and companies can put their money to avoid paying taxes. In other words, they don't have to pay taxes on the money they make in their home country if they put their money in a tax haven. These places usually have very low taxes so people can save a lot of money. It's important to remember that while this is legal, it's not always the most fair thing to do and it can lead to people and companies not paying their fair share of taxes.