Scalability in computing is like designing a playground that can easily accommodate more children as it becomes popular. It means setting up systems and software in a way that they can smoothly handle more users, data, or tasks without slowing down or crashing. Think of it as adding more swings and slides to a playground to make sure everyone can play without long waits or overcrowding. Scalability ensures that as websites, apps, or services become more popular, they can expand and keep running smoothly, providing a good experience for everyone who uses them.