Difference between interface and abstraction,Difference between encapsulation and abstraction, joins,keep and peek.

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Explanation of interface, abstraction, encapsulation, joins, keep and peek.

Interface is a blueprint of a class that defines the methods and properties that the class should implement.
Abstraction is a concept of hiding the implementation details and showing only the necessary information to the user.
Encapsulation is a mechanism of wrapping the data and code together in a single unit and restricting access to the data from outside the unit.
Joins are used to combine rows from two or more tables based on a related column between them.
Keep and Peek are methods used in queue data structure. Keep adds an element to the end of the queue while Peek returns the element at the front of the queue without removing it.

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