Hardstyle originates from Holland in the late 1990s, and takes its influences from hard trance, gabber, and hard house. These 3 styles blended together makes Hardstyles signature sound.
Hardstyle is recognised as having a highly compressed kick drum, and a reverse bass that is on the offbeat, approximately 140 BPM. It also utilises short vocal (usually female) samples, and early forms of Hardstyle were very similar to techno. During the mid 2000s it becale slightly more melodic using more trance-like riffs and synths.
The most famous part of Hardstyle is the way of dancing to it. Becoming extremely popular in The Netherlands, its almost like a shuffle, where the moves are done to the exact beat shown here: