Thermodynamics and Entropy - Our Irreversible Universe - NaturPhilosophie

Irreversibility A friend of mine once casually asked me over a drink: "What is entropy?" Eeep! Tricky question. Interesting concept. But... How do you define entropy in a non-mathematical way? How can you sum up entropy in 30 seconds? In one mental image. In a single concept... In one word. A form of energy? A measure of disorder in the Universe? Randomness? All of the above?