Abstraction is the way of making your classes more abstract by letting you define the behavior of the class without actually knowing what datatype will be handled by the operations of the class.
Behavior is how an individual acts. It is what an individual does to make something happen, to make something change or to keep things the same. Common types of behavior include moral, overt, covert, voluntary, etc
Abstraction shows solely the relevant attributes of objects and hides the non-essential details. For example, when we are driving a car than at that time our main concern is driving the car like start/stop the car, accelerate/ break, etc.
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