A Triplet is a group of three notes played in the same time as two notes of the same kind. The most common triplets are eighth note triplets, indicated by a curved line with the figure 3 above it.
The triplet is used frequently in rock drumming and jazz drumming, whether it be played as a fill (using snare and tom-toms and rolling around them), or various combinations between your hands and feet on the bass drum, and hi-hat.
Just as eighth notes are played smoothly when joined together, e.g.,
triplets are played smoothly also, e.g.:
Try these exercises going from eighth notes for 1 bar to triplet notes for second bar, using the bass drum to help you keep time.
Exercises using eighth note triplets.