A Beat Sequencer is a digital tool used in music production to create and arrange rhythmic patterns. It allows users to program beats by placing notes on a grid, where each row typically represents a different sound, such as a kick drum or hi-hat. This makes it easy to visualize and edit complex rhythms. Many modern music software programs, like Ableton Live and FL Studio, include built-in beat sequencers. These tools often feature various options for adjusting tempo, swing, and effects, enabling musicians to experiment with different styles and sounds in their compositions.