Explain the purpose of the main() function.

The main() function serves as the entry point for a C program. Here are its key purposes:

1. Program Execution Start: When you run a C program, execution begins from the main() function. It's where the program starts its operations.

2. Return Value: The main() function returns an integer value to the operating system. A return value of 0 typically indicates successful execution, while a non-zero value indicates an error.

3. Functionality Container: It can contain the main logic of the program, including function calls, variable declarations, and control flow statements.

In summary, main() is essential for defining how and where your program begins executing.