cURL is a command line tool for transferring files with URL syntax. The strong point of cURL is the number of data transfer protocols it supports (listed further down). Distributed under the MIT License, cURL is free software.
Libcurl is the corresponding library/API that users may incorporate into their programs; cURL acts as a stand-alone wrapper to the libcurl library. libcurl is used to provide URL transfer capabilities to numerous applications (open-source as well as proprietary).
Additional format support includes (and many other features):