Simulation is the word for an analytical technique that lets an analyst investigate the properties and circumstances of an item or situation by creating a model of said item or situation and then exposing it to different scenarios. This requires relatively in-depth knowledge of the thing being simulated – at least for accurate results. In other words – if someone wants to test the properties of an apple in a simulation, they need to know its weight, shape, and colour. Without that, results would be quite inaccurate and not very helpful.