In computing, a system call is the programmatic way in which a computer program requests a service from the kernel of the operating system it is executed on. This may include hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.
Operating system playlist is available at
https://www.youtube.com/playlist?list=PL_obO5Qb5QTE9s7QCNjqk97Q4UUgOseWP
