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We know IRC(Internet Relay Chat) and SOCKS protocol, they all have a concept of relay.

what's the meaning of relay there ? how to understand it?

put on hold as off-topic by grawity, Mokubai Jun 11 at 6:16

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is not about computer hardware or software, within the scope defined in the help center." – grawity, Mokubai
If this question can be reworded to fit the rules in the help center, please edit the question.

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    google.com/search?&q=define+relay look at the verb definition. – Mokubai Jun 11 at 6:03
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    to pass on to a destination. If I set my browser to use a Proxy, I send traffic to the proxy, and the proxy sends/relays it on to the webserver. – Frank Thomas Jun 11 at 6:03

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