What are these?

UNIX for Beginners Q & A UNIX for Dummies Questions & Answers
1

I am a student of IT and I have to study programming on Linux base network.

So, I want to know the exact means of these words:

  1. Socket
  2. API
  3. Interface
  4. Port

If someone knows the answer, please describe for me.

And if you know any web site that helps me, I will thanks to you.

With so thanks.
DIO

2

Please read the rules - posting homework questions is not permitted.

As for a website to help you - www.google.com

Thanks
ZB