curl stands for client URL, and you use it to talk to a server (URL) in whatever protocol you specify. Its used for development as a way to test client & server communication, built into applications to perform communication between a client & a server, and its used often because its extremely portable, has great error logging, can be rate limited, and can provide a substantial amount of detail about the communication.

[–] TheracAriane@thebrainbin.org 5 points 2 days ago (2 children)

@curbstickle@anarchist.nexus like Facebook is a server while the app on my mobile is a client ?

[–] elmicha@feddit.org 5 points 2 days ago

Yes, facebook is running on a web server and the app (or a browser) is a client.

[–] curbstickle@anarchist.nexus 2 points 2 days ago

Yes, though really its a lot of servers.

I wouldn't worry about tools yet, I'd recommend getting a book/wiki on networking if you'd like to learn, its knowledge that builds.