curl: Command-Line Tool for Data Transfer and Web Development

curl is a command-line tool used to transfer data to or from a server using various protocols such as HTTP, FTP, SMTP, and more. It allows users to send requests and receive responses from servers, making it a useful tool for testing and debugging web applications. curl supports a wide range of options and features, including authentication, cookies, SSL/TLS, and uploading files. It is available on most operating systems, including Linux, macOS, and Windows.