In the context of software systems, "scalability" refers to the capability of a system to handle increased load or traffic without compromising performance. Scalable software can adapt to growing user demands by effectively managing resource allocation, whether through horizontal scaling (adding more machines) or vertical scaling (enhancing existing systems). This is particularly important for businesses experiencing rapid growth or fluctuations in usage. A scalable architecture ensures that applications remain responsive and efficient, thus providing a better user experience. Ultimately, scalability is a critical criterion in software design and development, enabling future expansion.