There are two types of VST programs: VST instruments (a.k.a. VSTi) and VST effects. VST instruments produce sounds and VST effects change sounds. A synthesizer is a common example of a VST instrument. A reverb is a common VST effect.
In most forms of electronic dance music, sub bass synthesizer sounds are used to produce huge, club-worthy bass tones. They are responsible for the stomach-shaking rumble in drum n bass, the smooth vibrations in deep house, and the fat boom in hip hop.
It is safe to say that all dance tracks use lots of compression. House music is especially infamous for its over-the-top compression. But, there is a fine line between tasteful and unbearable.