A model is a kind of testing using technology to check before it finished! It has been used for lots of times by many people who want to test things out. The reason this kind of testing is so popular because it's safety, it cannot cause damage when something went wrong and we can fix the problem or problems without spending lots more money :) For example, if you tried to sell a newest car, the first think you want to do is to test it to see if it's safe or not. And if something went wrong, the tester can cause damage or even die so making a testing model is much more safer instead of testing by the real one :P
The simulation is kind of like the model but it based on real thing like we can feel like we are testing the real one. It contained speed, levels, power and everything as same as the real one exactly the same but model only allows you to tried to make a testing as close as possibly can. It's much safer when we test but not after it finished because there's might be some problems that we can see in the model but in the simulation :"
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