Scalability refers to the capability of a system to handle an increasing amount of work or its potential to be enlarged to accommodate growth. In the context of software and system design, scalability is crucial for ensuring that applications can efficiently manage rising user demands, data volumes, and transaction loads without compromising performance. There are two primary types of scalability: vertical (scale-up) and horizontal (scale-out). Vertical scalability involves enhancing a single node’s capacity, while horizontal scalability involves adding more nodes to distribute the load. Understanding scalability is essential for building resilient and future-proof systems in today’s digital landscape.