Inheritance is a mechanism in which one object acquires all the properties and behaviours of the parent object. Inheritance allows programmers to create classes that are built upon existing classes, to specify a new implementation to maintain the same behaviour to reuse code.

The main problem with implementation inheritance is that it introduces unnecessary coupling in the form of the "fragile base class problem" modifications to the base class implementation can cause inadvertent behavioral changes in subclasses, creates strong coupling and loose flexibility.