A redirect is a way to send both users and search engines to a different url than the one they originally requested & it is not harmful for website.
Check in more details about redirection at Seomoz.http://www.seomoz.org/learn-seo/redirection
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A redirect is a way to send both users and search engines to a different URL from the one they originally requested. Below are some of the commonly used types of redirects.
301 Moved Permanently
302 Found (HTTP 1.1) / Moved Temporarily (HTTP 1.0)
307 Moved Temporarily (HTTP 1.1 Only)
It is method of diverting traffic from one website to other. If you made modification in our website then you can redirect your traffic to new website from old one.