FileZilla is a free and open-source software used for transferring files over the Internet. It supports the FTP, SFTP, and FTPS protocols, allowing users to upload and download files to and from servers easily. The user-friendly interface makes it accessible for both beginners and experienced users. The software is available for multiple operating systems, including Windows, macOS, and Linux. FileZilla also offers a site manager feature, which helps users organize and manage their connections to different servers efficiently. Its reliability and speed make it a popular choice for web developers and anyone needing to transfer files online.