A system call is a programmed request made by a running application to the operating system’s kernel, asking it to perform specific low-level operations on its behalf. These operations can include tasks such as reading or writing files, allocating memory, creating processes, or accessing hardware devices. System calls provide a controlled interface between user-level applications and the core functions of the operating system, ensuring security and stability. In cybersecurity, monitoring system calls is crucial, as malicious software often exploits them to gain unauthorized access or control over system resources.