socks is an internet protocol that routes network packets beetwen client and server through server proxy.
socks4 is a simple extension to socks4 protocol that allows a client that cannot resolve the destination host domain name to specify it. There is no authentification. A client only requires a username to be able to access socks4 service.
socks5 more advetages :
-support udp and ipv6
-various authentification mechanisms
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