Scalability

Scalability is a system's capacity to handle an increasing amount of work or its potential to be enlarged to accommodate that growth. In a business context, this means the ability of an IT infrastructure, application, or process to perform efficiently under a greater load, such as an increase in users, data volume, or transaction rates, without a significant degradation in performance or user experience. Achieved through either vertical scaling (upgrading existing hardware) or horizontal scaling (adding more instances of servers or components), it’s a critical consideration for any system expected to grow over time.