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Object-oriented programming (Oop) is a design philosophy.
In OOP, everything is grouped as self sustainable "objects".This way you gain reusability.
To understand this concept clearly, let take an example of Man. Every man has some set of propertis which identifies it from others like height,weight,color etc.
If we consider man as a class then the object created from this man class should represent properties belong to man class.
for ex. object of man class A is in 70 kg in weight, height is 6 ft and fir in color. so every object of man class has same set of properies but object values may be differnt. for ex object of class B is 100 kg in weight and 5.5 in height.

Click on links in right hand side to understand each oop concepts clearly.