Like curl or this website specifically?
curl is a CLI tool used primarily to interact with webservers.
It can do much more than that, but its unclear what kind of an explanation you're seeking.
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Curl is a tool used to ask servers and websites for information from the command line. It outputs this information to you directly as stdout instead of just downloading a file to a given location. You can use pipes and redirections to work with this though
Usually it's used by developers.
Personally, I use it to get files from github or websites. If can also be used to send stuff to a server.
It's a very simple tool that just sends the request and gives the answer. If you were to point it at a website you'd get back the code a browser would normally use to make the website on your end.
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