Search Illustrated - A Column From Search Engine Land
Moving a website from one domain to another? The safest way to make the move is to use “redirects” which alert the search engines, so that you don’t damage or lose your current rankings after the move.

But redirects always inspire questions. Which type should I use? What will happen to all my links? Are they permanent or temporary? This week’s infographic illustrates the differences between 301 and 302 redirects:

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