what are the important terms used in computer and how they are useful?

Answer 1

There are way too many terms to be listed here , you can check out the following links:

Check out these links:

http://www.matisse.net/files/glossary.html

http://www.sharpened.net/glossary/
http://www.uic.edu/depts/accc/inform/v106.html

Microsoft's glossary:
I guess its the best
http://support.microsoft.com/default.aspx?scid=%2Fsupport%2Fglossary%2FDefault.asp

Answer 2

Way to many terms in computers both hardware and software to answer this question.