curl: Command-line tool for data transfer

curl is a command-line utility and libcurl is its underlying C library for transferring data to and from servers using URL syntax. The tool implements client-side support for numerous internet protocols through a unified interface, handling authentication, SSL/TLS encryption, and various transfer methods. curl operates as a single binary that can perform HTTP requests, file transfers, email operations, and real-time streaming across different network protocols. It serves as a foundation for web scraping, API testing, file synchronization, and automated data transfer workflows.