viruses meaning
A virus is a manmade program or piece of code that causes an unexpected, usually negative, event
Types of viruses
Trojan Horse
A trojan horse program has the appearance of having a useful and desired function. While it may advertise its activity after launching, this information is not apparent to the user beforehand. Secretly the program performs other, undesired functions. A Trojan Horse neither replicates nor copies itself, but causes damage or compromises the security of the computer. A Trojan Horse must be sent by someone or carried by another program and may arrive in the form of a joke program or software of some sort
Worms:
A worm is a program that makes and facilitates the distribution of copies of itself; for example, from one disk drive to another, or by copying itself using email or another transport mechanism. The worm may do damage and compromise the security of the computer. It may arrive via exploitation of a system vulnerability or by clicking on an infected e-mail.
Macro Virus:
Macro viruses are viruses that use another application's macro programming language to distribute themselves .They infect documents such as MS Word or MS Excel and are typically spread to other similar documents
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