What is 404 not found?
One of my friends telling he has a lots of 404 not found on his blog and did not show the previous URL after search by Google. I told him when you hosted your site and did you delete your previous site. He just let me yes he had a good blog about some tutorial and good rank on Google but somehow he lost his hosting server.
I gave him some idea regarding 404 not found or why page not found from Google Webmaster Tools. Actually, if someone request to server to display but the page does not exist the server will automatically return 404 not found error. Such type of problem clearly informs both browsers and search engine that the page is not existing on the live server. After that the article or content would not be crawled by search engine. If the 404 code response to a request that the page does not exist, then the server will show 404 page. This means the file or page is not found File not Found In SEO talk we can say broken link. Some time such type of broken link dramatically decries your traffic and visitor will never come to your site for the next time to surfing any things. So be careful about 404 or broken link. No worries I will give some effective tips around this issue how to recover shortly. Just follow and do this immediately.