# MITM

The Man-In-The-Middle - MITM - is a method where a service is placed between client and server to allow recording of the traffic between them.

MITM can also be used as a a computer security attack where the attacker secretly relays traffic between sender and receiver in order to circumvent  mutual [authentication](/glossary/a/authentication).

This allows the attacker to access, manipulate and modify the traffic without sender and receiver noticing.