FinOps is the practice of managing cloud spending as a shared responsibility between finance, engineering, and operations. It combines cloud cost visibility, optimization, and accountability. FinOps practitioners tag resources, analyze bills, identify waste (idle instances, overprovisioning, unused services), and implement controls (spending limits, RI purchasing, spot instance strategies). The goal: maximize cloud value while minimizing waste. Most organizations waste 30-40% of their cloud budget. A FinOps specialist finds that waste and eliminates it without sacrificing performance or agility.