What is instance

Answer 1

Instance is simply object of a class, e.g.:

class Shape{}

Shape circle = new Shape; // instance of class Shape
Shape square = new Shape; // another instance of class Shape

Answer 2

its an object of class, The chances are you have created a object from the Scanner class using the new keyword its the same as saying you have created an instance of class Scanner

Answer 3

The instance is one object of class. For example the definition of dog is the class Dog which describes all dogs. Instead Spot is my dog. So, Spot is an instance of dog's class.