curl

The term curl (Client URL) primarily refers to a command-line tool and library used to transfer data to or from a network server. It is widely used by developers to interact with APIs and download or upload files across various protocols like HTTP, HTTPS, and FTP.

https://curl.se/

curl is used in command lines or scripts to transfer data. curl is also libcurl, used in cars, television sets, routers, printers, audio equipment, mobile ...

Via: curl summer of Bliss - https://daniel.haxx.se/blog/2026/06/15/curl-summer-of-bliss/