Computer virus is a malware program thatĀ  when executed, replicates by inserting copies modifies into other computer programsĀ  data files or the boot sector of the hard drive. when this replication succeeds the affected areas are then said to be affected

Computer virus is a program which reproduce itself. It may attach to other programs which may create copies of it.It may damage or corrupt data, change data, or degrade the performance of your computer