The most common kind of virus is the worms. It can be found in different sizes and shapes. https://malwarezero.org/different-types-of-viruses-for-computers-a-beginners-guide/ It is very important to have an anti-virus software installed in your computer system to avoid any damages.A bug is a sort of malicious code or program that, when executed, reproduces by putting itself into other computer programs, information documents, or the boot sector of the disk drive. Consequently, computer viruses can spread out throughout a network of computers and create serious damages.