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    <p>Coming from the hardware development world. . .</p> <p>Simulation tests functionality. 2+2 = 4 etc</p> <p>Emulation tests the functionality on the specific environment (64-bit, 16-bit, fingers and toes).</p> <p>Here is a food example:</p> <p>You have two pieces of bread, one knife, peanut butter and jelly and will be giving them to a kindergartner. You write instructions on how to make a sandwich. </p> <p>In simulation, you would act out the process, pretend you opened the jars, pretend spreading the peanut butter etc.</p> <p>If at the end of the instructions your are left with only jelly and not peanut butter then you failed the simulation and you need to fix your instructions. On the other hand if you have a complete "sandwich" then the instructions should be valid</p> <p>In emulation, you would use close representations of the actual parts (same bread, knife peanut butter etc). What happens if you gave your kindergartner a cheap plastic knife and really really thick peanut butter?? The knife would break in emulation and the instructions would need to be clarified or fixed to accommodate this problem. In this case you might suggest warming up the peanut butter in the microwave.</p> <p>In practice: Consider a 64-bit system that you are programming in and a 32bit system that will actually be running the code. You add two very very large numbers and print the result. In simulation everything works (you managed to get the code right to add two numbers) In emulation however you find that you get the wrong answer. What happened? The emulation of the 32-bit system was unable to handle the large numbers. This is an example of correct functionality (i.e. simulation) but not proper support for your runtime environment (emulation)</p>
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    1. POWhat's the difference between emulation and simulation?
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    1. USToymakerii
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