There are suspension lifts and body lifts.
By lifting the suspension, you gain room for more suspension travel and larger tires/wheels. Larger tires and wheels provides more overall lift for the axles and chassis and gives more ground clearance.
A body lift raises the chassis off the frame, providing room for even larger wheels/tires which will (again) give more overall clearance.
A combination of the two can allow some pretty crazy ground clearance and suspension capabilities, though trouble can arise from extreme driveshaft angles and drivetrain and suspension stressors. There are ways around most of those problems, none of which are inexpensive.
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