user mode

User mode is a restricted environment in a computer's operating system where applications and programs run safely without direct access to critical system components. It separates user-level processes from core system functions, ensuring stability and security. When a program needs to perform privileged actions, it requests the operating system to handle those tasks on its behalf. This separation prevents individual applications from accidentally or maliciously damaging the system, allowing multiple programs to run simultaneously and reliably without interfering with one another.