2. A function is a group of statements that exist within a program for the purpose of performing a specific task.
We can use functions to divide and conquer a task

4. Benefits Simpler Code: Code is easier to read and understand.
Code Reuse:
Functions reduce duplication of code, if a specific operation is performed multiple times, it can be written once and used over and over again.
Better Testing:
With each task in its own block, its easier to test and develop.
Faster Development:
If a programmer has to develop multiple programs, and he discovers that certain tasks are common to them, he can write a function or functions to perform those tasks and reuse them.
Easier Facilitation of Teamwork:
Functions make it easier to do collaboration.

7. What mistake can we find in the following code?

8. Scope and Local Variables

9. Passing Arguments to Functions