
Whenever your web server serves up one of your web pages to a visitor (be they human or search engine) it also serves up a status code. This status code tells the visitor the state of the page and is composed of a three-digit number and a short description. Here's a complete list of Server Status Code Definitions.
For instance, 200 OK says the web page was downloaded successfully, while a 404 Not Found status code indicates that the page could not be found. Also a 301 Redirect will show when a visitor (human or SE) goes to one of your webpages that no longer exists and tells the visitor that the page has been permanently moved to a new location.
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