Drumstep is a dance-floor friendly variant of Drum n Bass which rose to prominence in the 2000s and 2010s in the UK and is still an underground and commercial success. Drumstep is defined as being highly synthed, heavy and grimey basslines, but its defining feature is that it is halfstepped.
Drumstep is not to be confused with Dubstep, which is often the case. Dubstep has tempos of around 130-150 BPM whereas Drumstep has tempos of 175-185 BPM, and often has sections of Jump-Up and Upfront Drum and Bass to add variety into the tunes.
Originally it wasn’t defined as a subgenre, it was simply known as halfstepped Drum and Bass, but with the rise of Dubstep, it was required it be defined to separate the 2 genres.
Popular artists known for Drumstep are artists such as Skrillex, Knife Party, Nero, et al.