模拟器是真实系统的替代品，但模拟器用于优化、理解和估计真实系统。

这个问题最好的答案可能是看一看历史实践。

在过去，我曾在PlayStation和SEGA的PC上看到过游戏主机模拟器。

模拟器是指那些试图模拟现实生活行为的软件，比如驾驶或飞行。《Gran Turismo》和《微软飞行模拟器》都是模拟游戏的经典例子。

就语言差异而言，模仿通常指的是模仿某人(或某事)值得称赞的特征或行为。仿真与模仿是不同的，模仿是为了嘲弄而复制一个人。

动词“simulation”在语言学上的意思基本上是假装或模仿某人或某事。

模拟器:类似于解释器。 也就是说，它实际上逐行执行真实的代码来模拟行为

模拟器:类似于可执行文件。 也就是说，它接受编译后的代码并执行它。

模拟是一种行为类似于其他事物，但以完全不同的方式实现的系统。它提供了系统的基本行为，但不一定遵守被模拟系统的所有规则。它的存在是为了让你了解事物是如何工作的。

模拟是一种行为完全类似于其他系统的系统，并且遵守所模拟系统的所有规则。它实际上是另一个系统的完全复制，甚至与仿真系统的输入和输出二进制兼容，但在与原始仿真系统的环境不同的环境中运行。规则是固定的，不能更改，否则系统会失败。

我不认为模拟器和模拟器可以比较。两者都模仿某些东西，但不是同一推理范围的一部分，它们不在同一上下文中使用。

简而言之:模拟器被设计用来复制原始程序的某些特性，甚至可以在真实环境中替换它。模拟器的设计不是为了复制原物的特征，而是为了在人类看来与原物相似。没有了原有的功能，仿真器无法在实际环境中代替原有的功能。

An emulator is a device that mimics something close enough so that it can be substituted to the real thing. E.g you want a circuit to work like a ROM (read only memory) circuit, but also wants to adjust the content until it is what you want. You'll use a ROM emulator, a black box (likely to be CPU-based) with a physical and electrical interfaces compatible with the ROM you want to emulate. The emulator will be plugged into the device in place of the real ROM. The motherboard will not see any difference when working, but you will be able to change the emulated-ROM content easily. Said otherwise the emulator will act exactly as the actual thing in its motherboard context (maybe a little bit slower due to actual internal model) but there will be additional functions (like re-writing) visible only to the designer, out of the motherboard context. So emulator definition would be: something that mimic the original, has all of its functional features, can actually replace it to some extend in the real world, and may have additional features not visible in the normal context.

A simulator is used in another thinking context, e.g a plane simulator, a car simulator, etc. The simulation will take care only of some aspect of the actual thing, usually those related to how a human being will perceive and control it. The simulator will not perform the functions of the real stuff, and cannot be sustituted to it. The plane simulator will not fly or carry someone, it's not its purpose at all. The simulator is not intended to work, but to appear to the pilot somehow like the actual thing for purposes other than its normal ones, e.g. to allow ground training (including in unusual situations like all-engine failure). So simulator definition would be: something that can appear to human, to some extend, like the original, but cannot replace it for actual use. In addition the pilot will know that the simulator is a simulator.

我认为我们不会看到ROM模拟器，因为ROM不与人类交互，我们也不会看到任何平面模拟器，因为在现实世界中，飞机无法有一个替代物来执行相同的功能。

在我看来，模拟器或模拟器中的模型可以是任何东西，并且不必与原始模型相似。一个ROM模拟器模型将很可能是软件而不是硬件，MS飞行模拟器不能比它更软件。

这两个术语的比较将与当前选择的答案(来自Toybuilder)相矛盾，后者将差异放在内部模型上，而我的建议是，差异在于假的是否可以用于执行实际世界中的实际功能(确实在某些可接受的范围内)。

注意，飞机模拟器还必须模拟地球、太阳、风等，这些都不是飞机的一部分，所以飞机模拟器必须模拟飞机的某些方面，以及飞机的环境，因为它不是在这个实际环境中使用，而是在一个训练室中使用。

This is a big difference with the emulator which emulates only the orginal, and its purpose is to be used in the environment of the original with no need to emulate it. Back to the plane context... what could be a plane emulator? Maybe a train that will connect two airports -- actually two plane steps -- carrying passengers, with stewardesses onboard, with car interior looking like an actual plane cabin, and with captain saying "ladies and gentlemen our altitude is currenlty 10 kms and the temperature at our destination is 24°C". Its benefit is difficult to see, hum...

总之，模拟器是一个真实的东西，旨在工作，模拟器是一个假的，旨在欺骗用户。

模拟器是真实系统的替代品，但模拟器用于优化、理解和估计真实系统。