What is Cohesion and Coupling?

Coupling: The coupling term is used to describe the degree of interdependence between the modules. Lower the coupling between the modules, the better the software is.

Cohesion: The cohesion term is used to describe the degree to which the elements of the module are related. Cohesion is a glue that connects all the modules together. All the elements of the module work together to perform a single task.

Higher the cohesion of the system, the better the software is.