Call

/ˈsɪs.təm kɔːl/

noun — “the polite way your program asks the OS for a favor.”

System Call is an interface provided by the operating system that allows user-level processes to request services from the kernel. These services can include file operations, process management, memory allocation, network communication, and hardware access. By using System Calls, applications can safely interact with low-level resources without compromising system stability or security.