What is a PAC file, how does it work, and what is the difference between a PAC file and a proxy?

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Accepted Answer

A pac file is a configuration file used by web browsers to automatically choose the appropriate proxy server for a given URL.

Pac file stands for Proxy Auto-Configuration file.
It contains JavaScript functions that define the rules for choosing a proxy server based on the URL being accessed.
Pac files are used by web browsers to automatically select the most suitable proxy server for a given URL.
Pac files can be hosted on a web server and referenced by browsers to dynamically update proxy settings.
Pac files are different from a traditional proxy server setup where a specific proxy server is manually configured in the browser settings.

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