Viruses VIRUSES A computer virus is a kind of malicious computer program, which when executed, replicates itself and inserts its own code. When the replication is done, this code infects the other files and program present on your system. These computer viruses are present in various types and each of them can infect a device in a different manner. To know more about them lets study some basic fundamental of computer viruses:- What is a Computer Virus? A computer virus is a program which can harm our device and files and infect them for no further use. When a virus program is executed, it replicates itself by modifying other computer programs and instead enters its own coding. This code infects a file or program and if it spreads massively, it may ultimately result in crashing of the device. Since the computer virus only hits the programming of the device, it is not visible. But there are certain indications which can help you analyze that a device is virus-hit. Given below are s