what is instance

Answer 1

Basically an instance is an object.
Think of it like this:
When you buy a car, you got an instance of a Car Blue print called Class in programming language.
so your car has some properties like a color...

My car would be another instance of the same blue print of the car you bought and my favourite color is silver.
Hope this help.

Answer 2

Think of it as a real PRODUCT (with eg color) of an hand sketch car (black and white).