Load testing checks how a website or service behaves when many people use it at once. A team can see whether pages slow down, errors appear, or the service continues working as expected.
It is like inviting a practice crowd into a new venue before a real event to see whether the doors and seats can handle them.
The test should use safe, agreed limits so it does not overload a live service or affect real customers. Its results describe the conditions tested, not every possible future situation.