A 301 redirect is a permanent redirect from one URL to another. 301 redirects send site visitors and search engines to a different URL than the one they originally typed into their browser or selected from a search engine results page. For more redirect to http://socialprachar.com
A 301 redirect is a permanent redirect which passes between 90-99% of link juice (ranking power) to the redirected page.
it refers to the HTTP status code for this type of redirect.
301 Moved Permanently.