A 404 error page tells you and search engines that a page is not found by displaying a text similar to it "Sorry, the page you were looking for in this blog does not exist.". This may happen because you have changed your URLs over time, either removed a few pages when you overhauled your design or a visitor may have accidentally misspelled an URL inexistent in your blog, so it automatically redirects to the 404 error page (page not found).
And probably this will not make a good impression on the greatest potential users of our blog. Before the user clicks the back button or close the window/browser's tab, thus leaving our site forever, we may want to redirect 404 error in Blogger to a page, where are chances that the visitor will continue reading our blog.
One of the most used methods is the "meta refresh" but the problem with this method is that it breaks navigation (doesn't allow to return back). In this case, the best method is by using Javascript about which I will go in detail below.




















Important: Removing or deleting your Blogger blog will also delete all of your blog data, including your existing blog posts. This means that your blog visitors won't be able to view your blog anymore, and that posts and pages associated with Blogger will be removed from your blog. 


