Auto Scaling is a cloud computing feature that automatically adjusts the number of active servers based on current demand. When traffic increases, it adds more servers to handle the load, ensuring that applications run smoothly. Conversely, when demand decreases, it reduces the number of servers to save costs. This process helps maintain optimal performance and efficiency without manual intervention. Amazon Web Services (AWS) and Microsoft Azure are examples of cloud providers that offer Auto Scaling services, allowing businesses to respond quickly to changing workloads while minimizing resource waste.