computer virus noun A program which can covertly transmit itself between computers via networks (especially the Internet) or removable storage such as CDs

computer virus noun A program which can covertly transmit itself between computers via networks (especially the Internet) or removable storage such as CDs, USB drives, floppy disks, etc., often causing damage to systems and data. A software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer.