Voelke's right, as is silverbull. House is 4 on the floor electronic dance music than, in some of it forms, contains more organic intrumentation than typically heard in trance (which is generally faster) or techno (which is, generally again, a more industrial based music that derives its strength from repeated rhythms). But of course there is house, tech house, techno house, funky house, disco house, deep house, soulful house blahdiddy fuckin' blah. There's also many tracks which some would call progressive house, others deep trance, some that could be tech house or minimal techno. There is no real definition other than that it is 4X4 EDM invented (more or less) by brothers from Chicago (Marshall Jefferson, Frankie Knuckels, Jesse Saunders) while folks in NYC (Lerry Levan and others) were developing a similar music which came to be called garage. Both of these are (like it or not) outgrowths of disco incoporating more synthesized, modern recording technology.