The primary difference between scalable architecture and non-scalable architecture lies in their ability to handle growing workloads. Scalable architecture can accommodate increased demand by adding resources, such as servers or storage, without major redesign or disruption. This flexibility is crucial for organizations experiencing fluctuating traffic and data loads. Conversely, non-scalable architecture has fixed resources, making it less adaptable to growth and requiring significant restructuring to manage increased demands. Thus, scalable architecture supports sustainability and operational efficiency in dynamic environments, enhancing long-term performance and resilience.