you have a deck of cards arranged from 1 to 1000 and you shuffle the deck. Then you check the cards one by one to see how they are numbered. The probability of it again being numbered 1 to 1000 (ordered) nicely is far lower than the probability of it being a jumbled mess (disorder). All systems tend to disorder ( and this is interestingly kind of an indication of the direction of the arrow of time)

About energy, consider this: energy cannot be created or destroyed. But then why dont we have unlimited energy because energy cannot be destroyed? The thing is each form of energy has a different 'quality' or 'order' to it. The lowest quality energy you can get (I think) is ambient heat. You cannot, even in theory, create a machine that can extract ambient heat from the environment to power your whatever devices and cool down the environment at the same time. There must be a difference in heat for energy extraction to be possible. So lets say you have a light bulb. You convert electricity (high order) to light (lower order). The light then becomes heat in the end (lowest order) and equilibrize with the environment heat. Now you cannot extract the same heat from the environment to convert into electricity to power your light bulb as before.

edit

This post has been edited by Clea: Jul 28 2021, 01:01 PM