Definition
Auto scaling is a cloud computing feature that automatically adjusts the number of computing resources, such as servers or virtual machines, allocated to an application based on demand. It works by monitoring key performance metrics and launching or terminating instances to maintain optimal performance and availability. This capability is crucial for ensuring applications can handle fluctuating workloads efficiently, preventing both performance degradation during peak times and unnecessary costs during lulls. For instance, an e-commerce website might automatically scale up its web servers during a holiday sale to accommodate increased customer traffic. Unlike manual scaling, which requires human intervention, auto scaling operates autonomously. Understanding auto scaling is essential for cloud certifications like AWS Certified Solutions Architect and CompTIA Cloud+.