A typical MITM (Man in the Middle) Attack is just like getting in between a telephone conversation, remaining transparent and at the same time interacting with both the participants posing as the person at the other end. The attacker is able to listen to a conversation that he is not supposed to listen to and even alter the course of the communication, remaining invisible and undetected all the while. Hackers need not be using even a trusted network. Proximity is the element that works in their favor.”]
Source: https://hackercombat.com/man-in-the-middle-mitm-attacks-an-introduction/