A bug is a kind of harmful code or program that, when executed, replicates itself by customizing other computer system programs and placing its own code. When this replication prospers, the affected areas are then stated to be infected with a virus.
Infections often spread out by developing a copy of themselves on a user's computer system without the user's understanding or authorization. In most cases, infections will be spread out by email attachments or by files shared on peer-to-peer networks. As soon as a virus has actually infected a computer system, it can infect other computers on the very same network.
Some viruses are set to spread themselves in a way that might cause major damage to a computer system. A virus might erase files, fill a tough drive with ineffective data, or corrupt system files. In some cases, a virus may even show a message or image that is designed to terrify the user.
https://ivfsurvivalguide.com/?p=2557 A lot of viruses are fairly harmless, and only cause minor inconvenience to the user. However, some infections can be extremely hazardous, and can cause prevalent damage to computer system systems.