TURN is a network protocol which allows the agents to get data through TCP or UDP.
TURN (Traversal Using Relay NAT) is also known as SPAN (Simple Protocol for Augmenting NATS). It is to pierce the NAT using Relay.
Very similar to STUN, it allows a user who is behind the NAT to get its public address through some mechanisms. The difference bewteen TURN and STUN is that the address which the user get through TURN is the address of a TURN server, however, through STUN, it would get a exterior NAT address.
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