A Man-in-the-Middle (MITM) attack is a type of cyberattack where an attacker secretly intercepts and possibly alters the communication between two parties who believe they are directly communicating with each other. Imagine you're sending a message to a friend, but instead of going straight to them, it first goes through a hacker who can read or change it before passing it on. This kind of attack can be used to steal sensitive information like passwords, credit card numbers, or to manipulate conversations. It’s like someone eavesdropping on your private conversation and sometimes even chiming in without you noticing.