A cantrip is a spell that can be cast at will, without using a spell slot and without being prepared in advance. Repeated practice has fixed the spell in the caster's mind and infused the caster with the magic needed to produce the Effect over and over. A cantrip's Spell Level is 0.

Are cantrips unlimited?

Any character can cast any cantrips they know at will and an unlimited number of times, unless the feature that lets them cast it specifically says otherwise.

How often can you use cantrips?

Cantrips are free magic — if you know a cantrip, you can cast it as many times as you want, whenever you want. Cantrips don't need to be prepared, and they don't use up Spell Slots.