* Tire changes: This is the most common reason. Jacking up the car allows you to safely remove and replace a flat tire or change a tire for seasonal reasons (e.g., switching to winter tires).
* Brake repairs and maintenance: Inspecting, replacing brake pads, rotors, calipers, and other brake components requires access to the wheels and undercarriage.
* Suspension work: Replacing shocks, struts, springs, or other suspension components often necessitates lifting the vehicle.
* Exhaust system repairs: Working on mufflers, catalytic converters, or other parts of the exhaust system requires access from underneath.
* Oil changes (in some cases): Some vehicles might require jacking up for easier access to the oil drain plug. Many modern cars, however, have easily accessible plugs without needing to lift the car.
* Undercarriage cleaning and inspections: Washing or inspecting the underside of the car for rust, damage, or leaks.
* Other repairs and maintenance: Anything requiring access to the bottom of the car, such as repairs to the transmission, differential, or other components.
In short, jacking up a car provides the necessary clearance and stability to perform various maintenance and repair tasks safely.