what is the difference between 301 redirect and 302 redirect ?

[Jadanjesse]

A 301 redirect is key to maintaining a website's domain authority and search rankings when the site's URL is changed for any reason. It easily sends visitors and search engines to a different URL than the one they originally requested -- without having to actually type in a different URL.
A 302 redirect means that the move is only temporary. Search engines need to figure out whether to keep the old page, or replace it with the one found at the new location.