Question

Meaning of the sentence the entropy of the system is always increasing

Answer 1

Entropy means disorder.So here the sentence means natural processes will always proceed in the direction that increases disorder of the system

Answer 2

The total entropy of a closed system is always increasing is a way of stating the second law of thermodynamics. A closed system is a system that does not interact in any way with its surroundings. In practice there are really no closed systems except, perhaps, the universe as a whole.