A man-in-the-middle (MITM) attack occurs when someone sits between two computers (such as a laptop and remote server) and intercepts traffic
"This person can eavesdrop on, or even intercept, communications between the two machines and steal information.
Man-in-the-middle attacks are a serious security concern. Here's what you need to know, and how to protect yourself.
Two's Company, Three's a Crowd
The 'beauty' (for lack of a better word) of MITM attacks is the attacker doesn't necessarily have to have access to your computer, either physically or remotely. He or she can just sit on the same network as you, and quietly slurp data. A MITM can even create his own network and trick you into using it..."
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