Deniable encryption is a way to hide messages so that others can't see them. It works by encrypting the message, which means it turns the information into a jumble of letters and numbers that nobody can read. When somebody tries to decrypt the message, they won't be able to read it, because they don't have the key to unlock the jumble. But someone with the key can unlock it and read the message. It's like putting a padlock on a box so that nobody else can get in.