What is the main function of File Transfer Protocol (FTP)?

The main function of File Transfer Protocol (FTP) is to facilitate the transfer of files between devices over a network. This protocol enables users to upload and download files, manage directories, and perform file operations, such as renaming or deleting files, on remote servers. FTP is particularly useful in contexts such as website development, where developers can upload their files to a web server, or in any scenario where files need to be shared or synchronized between different computers.

The other options focus on functions that are not related to FTP. Accessing web servers typically utilizes protocols like HTTP or HTTPS, which are specifically designed for web browsing. Sending emails is the primary function of protocols such as SMTP (Simple Mail Transfer Protocol) and IMAP (Internet Message Access Protocol). Editing websites can involve various tools and technologies, but it generally does not fall under the purview of FTP, which strictly handles file transfers rather than editing content.