cURL is the name of the project. The name is a play on 'Client for URLs',
originally with URL spelled in uppercase to make it obvious it deals with
URLs. The fact it can also be pronounced 'see URL' also helped, it works as
an abbreviation for "Client URL Request Library" or why not the recursive
version: "Curl URL Request Library".

The cURL project produces two products:
libcurl
A free and easy-to-use client-side URL transfer library, supporting FTP,
FTPS, HTTP, HTTPS, SCP, SFTP, TFTP, TELNET, DICT, FILE, LDAP and LDAPS.
libcurl supports HTTPS certificates, HTTP POST, HTTP PUT, FTP uploading,
kerberos, HTTP form based upload, proxies, cookies, user+password
authentication, file transfer resume, http proxy tunneling and more!
libcurl is highly portable, it builds and works identically on numerous
platforms, including Solaris, NetBSD, FreeBSD, OpenBSD, Darwin, HPUX,
IRIX, AIX, Tru64, Linux, UnixWare, HURD, Windows, Amiga, OS/2, BeOs, Mac
OS X, Ultrix, QNX, OpenVMS, RISC OS, Novell NetWare, DOS and more...
libcurl is free, thread-safe, IPv6 compatible, feature rich, well
supported and fast.

curl
A command line tool for getting or sending files using URL syntax.
Since curl uses libcurl, it supports a range of common Internet protocols,
currently including HTTP, HTTPS, FTP, FTPS, SCP, SFTP, TFTP, LDAP, LDAPS,
DICT, TELNET and FILE.