Full system simulator

A full system simulator is like a pretend world that helps us test how computer programs will work, but instead of people or animals, there are computer chips and software programs that can pretend like they're running on a real computer system. Just like how you might use blocks or Legos to build a pretend city, programmers use full system simulators to build a pretend computer system.

In the pretend computer system, there are pretend parts like processors, memory, and storage, just like in a real computer. When we write a computer program, we can use the simulator to see how it would work on a real computer system, even if we don't have access to one yet.

But the cool thing is that we can also change things around in the pretend computer system to see how they would affect the program. For example, we can make the pretend processor run faster or slower, give it more or less memory, or even change the pretend computer's operating system. This way, we can see how our program would perform in different scenarios, helping us find any problems and ways to fix them before we use a real computer system.