Entropy is, in simple terms, a measure of chaos or disorder in a system. Imagine that you cleaned your room: everything is in its place, order! But after a while, things are scattered again, and chaos has returned. This process of disorder is the manifestation of entropy.
When we ask "what is entropy in simple terms?", we can say that it is a way to describe how scattered or random things are in the world. For example, if you spill a bag of sugar on the floor, its particles will be everywhere, not in one place — this is an example of high entropy.
Entropy affects our everyday chaos, as every time we try to bring order, we are working against the natural tendency towards disorder. This does not mean that there will always be a mess, but effort is needed to maintain order.
So, entropy is like what causes everything around us to spread out and mix, even when we try to keep everything under control.