OK Wesker, I will give that a try:

There are many different sides to computer security so they are split up for easy understanding?

1. Computer Security.

This is the security of the computer in front of you. The one that you are using right now. It can be stopping people using it, even physically stealing it. Also preventing viruses, trojans, keyloggers. Even having your data stolen?

2. Network Security

Here you are providing a network service such as at a school or business. You need to protect this service and the people who use it. These are "servers" that their "client" machines connect to.

3. Web Security

This means the Internet. In theory it is very similar to network security, but because of the external links and lesser control it can be much more complex.

4. Programming Security.

Not too sure on this but with my systems I make sure that the application will only let authorised persons do what they are allowed. I would call it "applications security" Perhaps you could give me an idea of where you came across the term?

Hope that helps