A "4x4" refers to a vehicle with four wheels that can receive power from all four wheels simultaneously. This feature enhances traction and stability, making 4x4 vehicles ideal for off-road driving and challenging terrains. They are commonly used in SUVs and trucks designed for rugged conditions. The term "4x4" can also describe the drivetrain system itself, which allows for better control in various driving situations. Many outdoor enthusiasts and adventurers prefer 4x4 vehicles for activities like camping, hiking, and exploring remote areas, as they can navigate through mud, snow, and rocky paths more effectively than standard two-wheel-drive vehicles.