What is the purpose of file transfer?

The purpose of file transfer is primarily to enable the movement or copying of files from one computer to another over a network. This process is essential for sharing data between devices, whether they are in the same location or connected through the internet. File transfer protocols (such as FTP, SFTP, or HTTP) facilitate this process, allowing users to securely and efficiently transfer files across different systems.

While creating backups of data can involve file transfer, it is not its sole purpose. Similarly, optimizing computer performance and deleting unnecessary files do not relate directly to the function of transferring files between systems. Instead, these actions pertain to data management and system maintenance. Thus, option B accurately captures the primary intent behind file transfer activities.