Q. What is IntelliSense?
...OR
Q. Smart Compile Auto Correction feature

IntelliSense is responsible for those boxes that open as you write your code, listing all the possible option and even completing your typing for you.
It has a number of options as follows:

1. List Members- List the members of a object.
2. Parameter Info- List the arguments of procedure calls.
3. Complete word- It completes typed words.
4. Automatic Brace Matching- Add parenthesis or braces as needed.