Essentially, computer viruses are malicious software programmes that are difficult to detect and that propagate quickly across computer systems, damaging data or interfering with processor and memory...

Essentially, computer viruses are malicious software programmes that are difficult to detect and that propagate quickly across computer systems, damaging data or interfering with processor and memory systems. They are also known as computer trojans.
Discuss the many types of software that are associated with computer viruses.