Load testing is a way to check how a system or website behaves when many people use it at the same time. It shows if the system can handle heavy traffic without slowing down or crashing.

How it works

Special tools create lots of fake users who all send requests at once - like logging in, browsing pages, or buying products. The test measures how long responses take, how many errors appear, and the maximum load the system can handle before breaking.

Analogy

Think of a bridge. To test it, you let more and more cars drive across at the same time. If the bridge stays strong and traffic flows, it's good. If it shakes, bends, or blocks cars, you know it can't handle rush hour.