What is OOPs? Difference between Overloading and overriding, what is polymorphism, what is database, what is candidate key, How we train model in ML, difference between call by value and call by reference, what is primary and foreign key, use of primary key.

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OOPs stands for Object-Oriented Programming which is a programming paradigm based on the concept of objects.
Overloading is when multiple methods have the same name but different parameters, while overriding is when a subclass provides a specific implementation of a method that is already provided by its parent class.
Polymorphism is the ability of an object to take on many forms. In Java, it is achieved through method overloading and overriding.
A database is a collection of data that is organized in a way that allows for efficient storage, retrieval, and manipulation of data.
A candidate key is a column or set of columns in a table that can uniquely identify each row in the table.
In ML, we train a model by feeding it data and adjusting its parameters until it can accurately predict outcomes for new data.
Call by value is when a copy of the argument is passed to the function, while call by reference is when a reference to the argument is passed to the function.
A primary key is a column or set of columns in a table that uniquely identifies each row in the table. A foreign key is a column or set of columns in one table that refers to the primary key of another table.
The primary key is used to enforce data integrity and ensure that each row in the table is unique.

What is OOPs? Difference between Overloading and overriding, what is polymorphism, what is database, what is candidate key, How we train model in ML, difference between call by value and call by reference, what is primary and foreign key, use of primary key.

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