A 301 redirect tells the search engine that the page has moved permanently to the new URL. A 302 redirect tells the search engine that the move is only temporary, earch engines handle 301 redirects the same

301 Moved Permanently. A 301 redirect is a permanent redirect which passes between 90-99% of link juice (ranking power) to the redirected page. 301 refers to the HTTP status code for this type of redirect. In most instances, the 301 redirect is the best method for implementing redirects on a website.

301 redirect is that a lot of confusion as to what to do when delete, move or want to redirect incoming web traffic from an 'old' web page to a new web page.