What is a Coinstar kiosk?

Could you elaborate on the functionality and purpose of a Coinstar kiosk in the realm of finance and cryptocurrency? I've heard the name but am unclear on its exact role in today's digital financial landscape. Specifically, does it cater to crypto enthusiasts, or is it primarily for traditional coin exchange? How does it operate, and are there any associated fees or limitations? Understanding its place in the broader financial ecosystem would be greatly appreciated.