What are the differences between if-else and else-if?

Question

I am trying to discern the difference between:

if 
else

and

else if 

How do you use these? And when do you use them and when not?

Answer 1

**IF** you are confused
 read the c# spec
**ELSE IF** you are kind of confused
 read some books
**ELSE**
 everything should be OK.

:)