difference with usingproperties and without using properties

Question

Hi there
I am new for this forum, I have a little question here, pleaseclear my doubt, what is the advantages of properties(get,set), when we go forproperties? why we go for properties?,what is the difference between with usingproperties and without using properties?, because i searched in many link , iasked many people i could not get proper answer kindly clear my doubts, thanks in advance