Is a arear locking differential a 4x4?

An ARB locking differential is not inherently a 4x4 system itself; rather, it is a component that can be installed in a 4x4 vehicle. It enhances traction by locking the differential, allowing both wheels on an axle to turn at the same speed, which is especially beneficial in off-road conditions. While it is commonly used in 4x4 vehicles to improve performance, it can also be integrated into other types of vehicles.