Exactly 200 years ago, a French engineer introduced the idea of entropy, a reflection of our growing ignorance about the universe. Embracing this truth is leading to a rethink of rational decision-making and the limits of machines. Physicists view entropy as a measure of disorderliness, always on the rise. However, entanglement between information and energy is now transforming concepts of entropy, making it more opportunistic than nihilistic. Entropy is now seen as relative to an observer and is linked to various fields like information theory. Researchers are exploring new subjective ways to define entropy, suggesting that much of physics only makes sense in relation to an observer.
https://www.quantamagazine.org/what-is-entropy-a-measure-of-just-how-little-we-really-know-20241213/