Base64 is a way of turning messages into a string of letters, numbers, and symbols. It helps keep messages safe, so that only the person it was intended for can understand it. To turn a message into base64, we use a special rule to turn each letter into a different set of numbers and symbols. Then, when it's time to read the message, we use the same rule to turn it back into the letters it was made of originally. This way, we can make sure that only the person who is supposed to read it can do so.