A great number of individual molecules, in a gas for example, may behave in such a way that the over-all aspects of that gas produce predictable patterns in the aggregate, even though individual molecules may deviate from the norm. Laws describing such behavior must be formulated statistically, or probabilistically, rather than strictly dynamically. The dynamical laws then can theoretically be deduced as limiting cases of the probabilistic statements. In this context entropy is a probability function related to the degree of disorder in a system. The more disordered a system may be, the more likely it is.
All real processes go with an increase of entropy.
Viewed that way, we can see the Second Law all about us. We have to work hard to straighten a room, but left to itself it becomes a mess again very quickly and very easily. Even if we never enter it, it becomes dusty and musty. In fact, all we have to do is nothing, and everything deteriorates, collapses, breaks down, wears out, all by itself and that is what the Second Law is all about. Real processes include, of course, biological and geological processes, as well as chemical and physical processes.