Dab mats or glass mats are like coasters from your glass. It gives your piece something a little softer to sit on, which is nice for a glass tabletop, so you’re not clinking glass to glass. It can also help your piece sit more level, and it adds more friction to the base of the piece to keep it from sliding or knocking over as easily. But really, the main thing is that you get to put your functional art on some more functional art!
The dab mat also helps keep your table clean. Dabs are fucking messy, so this helps keep it clean. A silicone dab mat is best for dabbing as it is easy to clean with alcohol