curl is tool to transfer data from or to a server, using one of the supported protocols (HTTP, HTTPS, FTP, POP3 etc)
What can I do with curl?
You can get the weather:
$ curl https://wttr.in
You can download hacker news
$ curl https://news.ycombinator.com/
You can read a file from Github
$ curl https://raw.githubusercontent.com/facebook/react/master/README.mdYou can even download files with the > command
curl -L https://bit.ly/express-hello-world > index.js