What role does the "main function" play in programming languages?

The main function is crucial in programming languages as it serves as the entry point of a program, where execution begins. When a program is run, the system or runtime environment looks for the main function to start executing the code. This function typically contains the core logic of the application and may call other functions, manage program flow, and control the sequence of operations. Understanding the role of the main function is fundamental to grasping how programs are structured and executed in various programming languages, as it ensures that the program begins running in a well-defined manner.