Page not found. Happens when the web page has been deleted, but links to it still exist. They are very bad for both user experience and website health and it is generally best to set up a 301 redirect instead.
About the Author: Chad Klingensmith
Chad is a Sr. SEO Strategist for Rio SEO. He has over 10 years of experience in the digital marketing vertical. He enjoys researching and applying cutting edge marketing strategies to help clients achieve optimal online visibility.