Sorry Rob, the different genres of Electronica Dance is difficult to explain in words but here are examples:
ambient eg orbital, Brian Eno, KLF
drum n bass eg Lamb, Tricky & Squarepusher
garage eg artful dodger, azzido da bass, pier piper
house eg basement jaxx, Altern-8, Roger Sanchez
techno eg aphex twins,daft punk, dave clark
trance ef BT, jam & spoon
euro house (usual appeal to the bengkids) eg Sash, 2 Unlimited, most Italian house like Picotto Mauro
Hardcore eg Joey Beltram, Prodigy, SL2, Smart E
Nu Jazz eg Bartholomaus & Raabstein
styles crossover one another like tech-house and there can also be one style from different region like Detroit techno or Chicago techno. Confusing huh? Even the best of dance followers get their styles crossed. 