Question

what do you mean by buoyant force?​

Answer 1

Answer:

The upward force exerted by any fluid upon a body placed in it — compare archimedes' principle.

Answer 2

The buoyant force comes from the pressure exerted on the object by the fluid. Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top - hence the net upward force. The buoyant force is present whether the object floats or sinks.