More generally, entropy means a process in which order deteriorates with the passage of time. It has several special meanings in data communications.
Many scientists believe that the universe is naturally evolving toward a state of maximum entropy.
The example commonly cited is the tendency for thermal differences to disappear. According to the so-called theory of entropy, everything in the universe will ultimately attain a uniform temperature. There will be no energy sources or absorbers. Stars and galaxies as we know them will cease to exist. There will be no life.