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Where is localhost folder located in Mac or Mac OS X?

On Mac and Mac OS X, the localhost folder is located at:

On Mac and Mac OS X, the hosts file is located at:

/private/etc/hosts

This is a plain text configuration file that maps hostnames to IP addresses. By default, it contains an entry for 127.0.0.1 localhost, which resolves the hostname localhost to the loopback IP address. You can add custom entries to this file to map additional hostnames to local IP addresses for testing and development purposes.

Note that this is a standard system file, not a virtual folder. It physically exists on your drive and is used by the operating system and applications to resolve local hostnames.