Here's a breakdown:

* Groundwater is water that exists underground in the spaces between soil particles and rock formations.

* Aquifers are underground layers of rock or sediment that hold groundwater. These layers can be porous, allowing water to flow through them.

* Water table is the upper limit of the groundwater. It's the level below which the ground is saturated with water.

So, the liquid between layers of rock is essentially groundwater that has seeped into those spaces.