+A **System Call** is how a running [program](/wiki/program) asks the [operating system](/wiki/operating_system) for a service. It's a bridge from user-space to the [kernel](/wiki/kernel)'s protected functions, essential for tasks like accessing hardware or managing files.
+## See also
+- [Process](/wiki/process)
+- [Interrupt](/wiki/interrupt)
+- [Privilege Level](/wiki/privilege_level)