What does 'low in coupling and high in cohesion' mean

Question

I have problems understanding the statement low in coupling and high in cohesion. I have googled and read a lot about this, but still finding it hard to underst

Answer 1

Inheritance or generalization is an example of high coupling (i.e. high interdependence). What I meant by this is that in inheritance often the parent class defines base functionalities that is used by its child class and change in methods of parent class directly impact its child classes. Hence we can say that there is a greater degree of interdependence between classes.

Realization or using interface is an example of high cohesion (i.e. low interdependence). What this means is that an interface put forward a contract for any class that implements it but each class has the right to implement methods declared in interface in its own way and changes in method declared in one class doesn't affect any other class.