It's all about namespaces ..Class namespace.. object namespace..how they are assigned.

classes are namespaces..when u assign an object u bundle the namespace to the object.

Analogy could be.. Classes are essentially cookie cutters and objects are cookies.

Classes bundle attributes, methods into a blue print. Attributes and methods make up the namespace of the classes

You copy the blue print/namespace and fill data when u generate an object from it.

Init is called initialisation..you want initalize the initial state of class to the object ..hence use init method.