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Computer Glossary - F

File allocation table
File Allocation Table (FAT) is a partially patented file system developed by Microsoft for MS-DOS and was the primary file system for consumer versions of Microsoft Windows up to and including Windows Me. The FAT file system is relatively uncomplicated, and is supported by virtually all existing operating systems for personal computers.

File transfer protocol
FTP or File Transfer Protocol is used to transfer data from one computer to another over the Internet, or through a network.

A firewall is a hardware or software device which is configured to permit, deny, or proxy data through a computer network which has different levels of trust. A firewall's basic task is to regulate the flow of traffic between computer networks of different trust levels, typical examples are the Internet which is a zone with no trust and an internal network which is a zone of higher trust.