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The scalability of a system describes how well it can grow and adapt to increased demands without sacrificing performance. Successful scaling allows for efficient resource utilization and optimization of operational costs.
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Scalability describes how well a system handles growing load through additional or more powerful resources.
Scalability arose as a systems and performance-planning question: applications should remain capable as users, data, or requests grow. Cloud architectures made horizontal scaling across more instances common.
Imagine a restaurant: more guests can be served with extra tables and teams; demanding dishes may require stronger kitchen equipment. Both paths have costs and limits.
The work a system must process during a period.
Additional similar instances share the work.
A limiting component determines overall performance.
Scalability helps match capacity to demand in a planned way. It does not remove algorithmic bottlenecks and may be constrained by storage, coordination, or cost.
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