SVC (Supervisor Call) ARM is a feature in the ARM architecture that enables the switching of the processor to a privileged mode, known as the Supervisor mode, to execute specific tasks or instructions that cannot be run in the user mode. It is basically a software interrupt that enables the operating system kernel to execute certain operations that require higher privileges.

When a SVC instruction is issued, the processor enters the Supervisor mode and jumps to a pre-defined address in the operating system kernel to execute the requested operation. The Supervisor mode has access to all the system resources and can perform privileged operations such as accessing system memory, controlling hardware devices, and scheduling tasks.

SVC ARM is widely used in modern operating systems such as Android, iOS, and Linux to handle system calls and interface with device drivers. It provides a secure way of executing privileged instructions and ensures that user applications cannot access sensitive system resources.