What is a paradiddle?

A paradiddle is a drum rudiment that involves playing four consecutive single strokes in the pattern: "RLRR" or "LRLL." The first two strokes are played with the right hand (R) and the next two strokes are played with the left hand (L). The paradiddle can be played at various tempos and dynamics and is commonly used in drumming to create intricate and interesting patterns. It is also a fundamental rudiment that helps develop coordination, speed, and control in drummers' playing.