Okay, so imagine you have a bunch of people who all have jobs to do. Some people work together on the same task, while others work on different tasks. Now, sometimes these people need to communicate and share information so they can all do their jobs better.
A normal cluster is a group of computers or servers that all work together to help each other out. It's like a big team of workers who all have different skills and tasks, but they work together and share information to make everything more efficient.
Each computer or server in the cluster has its own job to do, but they all work together towards a common goal. For example, a cluster might be used to process a lot of data quickly, manage a big website, or run complex scientific simulations.
Even if one computer in the cluster isn't working perfectly, the other computers can still pick up the slack and keep everything running smoothly. And if one computer goes down completely, the other computers will automatically take over its tasks so that everything keeps working as intended.
So, a normal cluster is like a team of computers working together, and it helps make things run faster and smoother.