Scalability
The ability to add or remove resources to handle a changing workload.
Scalability is the capacity of a system to handle increased demand by adding resources, or to reduce costs by removing them when demand drops. AWS enables two forms: vertical scaling (scaling up) increases the compute power of a single instance — for example, moving from a t3.small to an m5.xlarge — while horizontal scaling (scaling out) adds more instances behind a load balancer. The CLF-C02 exam often pairs scalability with elasticity; the key distinction is that scalability describes the architectural ability to grow, whereas elasticity refers to doing so automatically and dynamically in real time.
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