Explain the pillars of OOPs. Difference between abstract and interface.

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OOPs pillars are Abstraction, Encapsulation, Inheritance, and Polymorphism. Abstract classes cannot be instantiated while interfaces cannot have method implementations.

Abstraction: Hiding implementation details and showing only necessary information.
Encapsulation: Binding data and methods together to protect data from outside interference.
Inheritance: Creating new classes from existing ones, inheriting properties and methods.
Polymorphism: Ability of objects to take on multiple forms.
Abstract classes cannot be instantiated but can have method implementations.
Interfaces cannot have method implementations but can be implemented by multiple classes.

Explain the pillars of OOPs. Difference between abstract and interface.

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