What is a computer virus

Computer Virus (Computer Virus) in "The People's Republic of China Regulations on Protection of Computer Information System Security" has been defined, the virus that "the preparation of computer programs or computer functions to insert the damage or destruction of data, impact of computer use and the ability to burn incense in the virus from Panda I copied a set of computer instructions or code. " And in general textbooks and general information is defined as: use of computer software and hardware defects, be sent by the compromised machine and the destruction of computer data affecting the normal work of a group of computer instruction set or program code. Computer viruses first appeared in the 70's David Gerrold science fiction When HARLIE was One. The first scientific definition in 1983: the Fred Cohen (University of Southern California) doctoral thesis, "Computer Virus Experiment" "A can own (or evolution) The computer program into other programs, "promoter region viruses, macro (macro) virus, script (script) is the same concept of virus transmission mechanisms similar to biological viruses. biological virus is injected into cells among themselves.