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A man-in-the-middle (MITM) attack is a type of cyber attack where an attacker intercepts communication between two parties to eavesdrop on their conversation, steal data or manipulate the communication.

In this attack, the attacker can intercept the data being sent between the two parties and then modify it in some way before passing it along to the recipient, thus giving the impression that the communication is legitimate. The attacker can also steal sensitive information such as passwords, credit card details or other personal information that is transmitted during the communication.

To carry out a man-in-the-middle attack, the attacker must be able to intercept the communication between the two parties. This can be done in various ways, such as by intercepting wireless signals, hacking into a network or by physically inserting themselves between the two parties in some way.

To prevent a man-in-the-middle attack, it is recommended to use secure communication channels like HTTPS, SSH or VPN, which encrypt the data transmitted between two parties and prevent attackers from intercepting and modifying it. Additionally, users can also be cautious when accessing public networks and avoid transmitting sensitive information over unsecured connections.