What is true about computer viruses?

What is correct in the description of computer viruses is that "anti-virus software must be upgraded with the emergence of new viruses to improve the function of detecting and killing viruses"; computer viruses are destructive programs and have no logic in themselves. Wrong, the computer itself has no immunity to computer viruses; the characteristics of computer viruses are parasitic, destructive, contagious, latent, and concealed.

What is correct in the description of computer viruses is that "anti-virus software must be upgraded with the emergence of new viruses to improve its functions of detecting and killing viruses."

Computer viruses are destructive programs that have no logical errors in themselves, and the computer itself has no immunity to computer viruses. The characteristics of computer viruses are parasitic, destructive, contagious, latent and concealed.

Computer viruses are artificially created, destructive, contagious and latent programs that damage computer information or systems. It does not exist independently, but is hidden in other executable programs. When a computer is infected with a virus, it may affect the running speed of the machine at first, or crash and damage the system at worst. Therefore, the virus brings great losses to the user. Under normal circumstances, we call this destructive program a computer virus.

Computer viruses can be divided into three types according to the existing media: boot viruses, file viruses and hybrid viruses; according to the link method, they can be divided into source code viruses, embedded viruses and operating system viruses. 3 types; according to the system classification of computer virus attacks, they are divided into viruses that attack DOS systems, viruses that attack Windows systems, and viruses that attack UNIX systems. Today's computer viruses are constantly introducing new ones, including some unique new viruses that cannot be classified according to conventional types for the time being, such as Internet viruses (spread through the network, and some data carrying viruses are increasing), email viruses, etc. .

Computer viruses are recognized as the number one enemy of data security. Since 1987, computer viruses have received widespread attention around the world. Computer viruses were first discovered in my country in 1989. Currently, new viruses are developing in directions that are more destructive, more secretive, have higher infection rates, and spread faster. Therefore, it is necessary to learn the basic knowledge of computer viruses in depth and strengthen the prevention of computer viruses.

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