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An S wave is slower than a P wave and only moves through solid rock. This wave moves rock up and down, or side-to-side. Because P waves are compression waves, they can move through a liquid. However, S waves cannot move through a liquid. This is because a liquid is not rigid enough to transmit an S wave.
For seismic waves through the bulk material the longitudinal or compressional waves are called P waves (for primary waves) whereas the transverse waves are callled S waves (secondary waves). Since any material, solid or liquid (fluid) is subject to compression, the P waves can travel through any kind of material.