What is the difference between "object" and "var" types?

Question

Also, where we can use the first and the second, and for what reason?

Answer 1

Read on Object Oriented Programming. Start with trying the concept of 'classes'

Answer 2

Objects are instances of a class which is a refrenece type

Int is a primitive type but if you wrap it inside a interger object it becomes a refrenece type

Answer 3

After making sense of what a 'class' is, try other OOP concepts like Inheritance, Polymorphism, etc