The set of markers software places on a track to map where every beat falls.
A beatgrid is the grid of beat markers that DJ software lays over a track during analysis, telling it where each beat and downbeat sits so sync and quantize work.
Why it matters
An accurate beatgrid is what makes sync, looping, and quantized cues reliable. A drifting grid is the usual cause of a blend slowly falling out of time.
In practice
Software sets the grid automatically, but variable-tempo and live-played tracks often need the first downbeat and tempo corrected by hand.

