Scalability is the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth

Cloud computing scalability
Scalability is the capability of a system, network, or process to handle an increasing load on the system, or its potential to amplify and accommodate that growth.For details information regarding scaling please visit:Scaling in cloud

Scalability in Java
Your Java application scalability is really based on your vision. ... To scale horizontally (or scale out) means to add more nodes to a system, such as adding a new computer to a distributed software application. An example might be scaling out from one web server system to three.

Scalability testing in software testing
Scalability testing is an extension of performance testing. The purpose of scalability testing is to identify major workloads and mitigate bottlenecks that can impede the scalability of the application. Use performance testing to establish a baseline against which you can compare future performance tests.

Business to be scalable
In financial markets, scalability refers to financial institutions' ability to handle increased demands; in the corporate environment, a scalable company is one that can maintain or improve profit margins while sales volume increases.

Application to be scalable
Scalability is the ability of a program to scale. For example, if you can do something on a small database (say less than 1000 records), a program that is highly scalable would work well on a small set as well as working well on a large set (say millions, or billions of records).