Caster is an English word with multiple meanings depending on the context:
1. In mechanics: A caster is a wheeled device mounted to the bottom of furniture or equipment to facilitate movement.
2. In broadcasting: A caster refers to someone who broadcasts content, especially in esports or live streaming.
3. In fantasy/RPGs: A caster denotes a character who casts spells or magic.
4. In manufacturing: Caster sugar is a fine-grained sugar used in baking.
5. As a surname: Caster is an occupational surname of English origin.