Name the computer virus and their effect?

Answer 1

A backdoor is a kind of a Trojan horse virus. A Trojan horse virus is a file that appears to be one thing but is really a virus, for instance if you downloaded a certain screensaver, it would actually be a virus.

On the other hand, a backdoor is a term that means unauthorized access to a computer. It attacks either by spam e-mail, downloading files, or visiting certain websites. The way a hacker writes a backdoor is by using a program that builds an internet server, the hacker puts in a random IP address, and a TCP port number to communicate with it. They can then see everything you do, they can log keystrokes, look at files, and even launch webcams.