what is Impermeable Rocks???? and is infilteration and percolation same????

Those layers of rocks which cannot be penetrate by water or any liquids are called impermeable rocks. Such rock does not contain any pours. As shown in the figure below, the bottom layer of earth crust is impermeable.

Infiltration is a process of allowing every particle in water to pass completely from one layer to another layer.

Percolation is a process of allowing water to pass through small holes.