To put it simply, entropy is a measure of the thermal energy that cannot be used to do work. It’s the measure of chaos, randomness, or disorder in a system. Basically, it tells us how much energy is wasted in a process, how much is converted to heat but cannot perform useful work.

Have you tried referring to your textbooks? They usually provide a detailed explanation of these concepts. Additionally, there are many online resources and videos available that can help you understand them better.