Ride height is the distance between the bottom of the chassis and the surface. Ride height is usually changed by moving the spring limiters up and down on the shock.
Lower front ride height
Higher front ride height
Lower rear ride height
Higher rear ride height
If one end of the car is lower than the other, that end will typically have more grip, but big differences in ride height between front and rear make the car less stable.
Changes to ride height will also change the car’s droop if no other adjustments are made.