ELI5: Explain Like I'm 5

Full reserve banking

Full reserve banking is a type of banking where banks have to keep all of their deposits in reserve. This means that when you deposit money into the bank, they have to keep all of the money safe and cannot lend it out and make money from it. Instead, they can only lend out money from other sources, like other people lending to the bank. This is to keep your money safe and make sure banks aren't taking too much risk with your deposits.