what is 301, 302 redirection in seo?

[braketech]

301 - This and all future requests should be directed to the given URI.

302 - This is an example of industry practice contradicting the standard. The HTTP/1.0 specification (RFC 1945) required the client to perform a temporary redirect (the original describing phrase was "Moved Temporarily"),but popular browsers implemented 302 with the functionality of a 303 See Other.

[Randalerarm]

301 Redirection is permanent redirect a old URL to new URL and the benefit of its 301 redirection passed link juice about 92-99%.

302 Redirection is temporarily redirect a old URL to new URL and the 302 redirection not pass link juice.