Drum and bass or (commonly abbreviated to D&B or DnB, occasionally DaB) is a genre of dance music which emerged from the UK Warehouse/Rave scene in the early 1990s bringing influences from Techno, Dub, and Hip Hop, but mainly focusing on Breakbeat side of Rave rather than the House/Techno side of Rave (Orignally called Jungle Tekno as well as Drum and Bass, Jungle is still accepted but mainly refers to the Ragga Jungle and other Amen heavy DnB. The genre is characterized by fast breakbeats (typically between 160–190 bpm, occasional variation is noted in older compositions), with heavy bass, sub-bass lines, and occasional infra-bass lines. Over the first decade of its existence, the incorporation of elements from various musical genres led to many permutations in its overall style.

source: wikipedia