It's a fundamental drumming pattern with a steady and even succession of eighth notes played on the hi-hat or ride cymbal.
It involves a consistent bass drum hit on all four beats of a measure, emphasizing each quarter note (1-2-3-4) in a repetitive and steady pattern.
It is a syncopated drumming pattern with a swinging, triplet-based feel and includes alternating long-short rhythmic patterns.
It involves a faster and more intricate sequence of hits and the drummer plays four notes per beat, dividing each beat into four equal parts.