It's a file in your OS folder that overrides the DNS for a website. When I type in www.zen-cart.com, my browser finds the site based on the name-server that directs it there. If I made an entry in my host file like the one I posted above, it would tell my browser to instead use the IP address in the host file to find the site, which is how I typically work on websites that are not yet ready for the public.


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