One of the types of redirects (redirectes), which is used for "bonding»Web pages and even whole sites in case of moving them to new addresses.

301 redirect is perceived search robots as a message about the final transfer of the web resource and helps to save its indicators authority and reference weight, as well as, as a result, positions in search engines. In addition, the use of 301 redirectes allows you not to lose possible visitors who access the website at the old address.

Setting this up redirect performed directly in HTTP-code of web pages or through the server configuration file .htaccess.