House music is uptempo music for dancing and has a comparatively narrow tempo range, generally falling between 118 beats per minute (bpm) and 135 bpm, with 127 bpm being about average since 1996.

Far and away the most important element of the house drumbeat is the (usually very strong, synthesized, and heavily equalized) kick drum pounding on every quarter note of the 4/4 bar, often having a "dropping" effect on the dancefloor. Commonly this is augmented by various kick fills and extended dropouts (aka breakdowns). Add to this basic kick pattern hihats on the eighth-note offbeats (though any number of sixteenth-note patterns are also very common) and a snare drum and/or clap on beats 2 and 4 of every bar, and you have the basic framework of the house drumbeat.

This pattern is derived from so-called "four-on-the-floor" dance drumbeats of the 1960s and especially the 1970s disco drummers. Due to the way house music was developed by DJs mixing records together, producers commonly layer sampled drum sounds to achieve a larger-than-life sound, filling out the audio spectrum and tailoring the mix for large club sound systems.

Techno and trance, the two primary dance music genres that developed alongside house music in the mid 1980s and early 1990s respectively, can share this basic beat infrastructure, but usually eschew house's live-music-influenced feel and black or Latin music influences in favor of more synthetic sound sources and approach.

Source : http://en.wikipedia.org