What is main() function and its Importance in C Programming | Purpose of Main Function

What is the main function?
The main function is the entry point of your program. Like the main door of your house. without a door, you can not enter into the house. without the main function, you can not enter into the program.
In Computer programming, Whenever you execute a program, The main function is the first function to be executed. You must call other functions from main to execute them. and
There is only one main() function.