What is entropy? The most common definition people tend to have for this is that it is the measurement of the disorder in a system. Some people who try to be too clever for their own good reply that it's the change in heat with respect to time divided by the absolute temperature (this is the thermodynamic definition of entropy, but my initial question was implied to be conceptual, so answering with a definition is just pedantic and showy). Really, entropy is a rather interesting concept, because the "disorder" definition, while it fits, really isn't the best way to explain it. So let's try to understand it better.