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VOCABULARY
anti-virus software - a program that finds and removes viruses from a computer
app - a self-contained program or piece of software; an application, especially when downloadable to a mobile device
application - a self-contained program or piece of software
backup - a copy of files from a computer's hard disk, usually made on some external medium such as CD-ROM or flash drive. A backup is made in case the hard disk file(s) are erased or damaged.