FileZilla is a free, open-source software used for transferring files over the Internet. It supports the FTP, SFTP, and FTPS protocols, making it versatile for various file transfer needs. Users can easily upload and download files between their local computer and a remote server, such as a web hosting service. The software features a user-friendly interface that includes drag-and-drop functionality, making it accessible for both beginners and experienced users. FileZilla is available for multiple operating systems, including Windows, macOS, and Linux, ensuring a wide range of compatibility for users around the world.