Question: A system call is a method by which a program makes a request to the

Answer:

operating system for a specific service or resource.

When a program needs to perform a task that requires access to a system resource, such as reading from or writing to a file, it must make a system call to the operating system. The system call provides an interface between the program and the operating system, allowing the program to request the resource and the operating system to provide it.

Examples of system calls include opening and closing files, reading and writing data, creating and deleting processes, and managing memory. The exact set of system calls available depends on the operating system being used.

System calls are an important part of the operating system's role in managing the resources of a computer system. They allow programs to access system resources in a controlled and secure manner, and provide a standardized interface for programs to interact with the operating system.