What is 404 error in SEO ?

[lewissmith]

When it comes to search engine optimization and positive user-experience, custom 404 error pages are usually overlooked. A 404 (File Not Found) error page is what a user sees when they visit an invalid URL or non-existent page on your website. It’s called a “404″ error page because that’s the status code your server delivers to search engines. The 404 HTTP status code tells search engines to not index the page – because the page or URL is invalid and creates a poor search experience for the user. The search engines want to index and show the best results to their users so they don’t want to index these pages. So having 404 error page will help search engines index and crawl the pages of your website that matter and are useful to users; thus creating a positive search experience.

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