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Today, I want to talk about computer virus. One might think of a computer virus as a tiny computer program designed to perform mischief. Most computer users have heard about computer viruses. A computer virus is the result of a destructive program that someone has written and placed inside a computer program, which unsuspecting people then place in their computer system.
Some viruses can erase all the information from the place where it's stored on the computer's hard disk. But each virus is different. Some display strange messages on your computer screen; others make small changes in your computer programs.

Where do these viruses come from? They certainly don't float around in the air like some human viruses. Instead, like any other computer program, a human must create them.

Why do people create them? It's hard to say. Some people create these programs out of meanness to get even. While others create them just as a challenge. Why do yo