what is curl?

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.md

You can even download files with the > command

curl -L https://bit.ly/express-hello-world > index.js