Scalability vs Elasticity in Cloud Computing

In cloud computing, scalability and elasticity describe how cloud resources respond to changing workloads, but they serve different purposes. Scalability in cloud computing refers to the ability to increase or decrease resources in a planned manner. Organizations scale systems when they expect steady growth or predictable demand, such as onboarding new users or expanding applications over time. Scaling can be vertical (adding CPU or memory) or horizontal (adding more instances). Elasticity, on the other hand, is a core cloud-native feature that allows resources to automatically scale up or down in real time based on actual usage. When demand spikes, resources are instantly provisioned; when demand drops, unused resources are released—optimizing performance and cost. In short: Scalability supports planned growth, while elasticity enables instant adaptation to demand—both essential in cloud computing.