Definition
It is a concept in Object-Oriented Programming allows a class to leverage the behaviors and functionalities of other classes without directly inheriting from them.
This is achieved by by including one or more instances of other classes (i.e. creating objects) as part of its internal structure.
Example
class Engine:
def start(self):
print("Engine started")
class Car:
def __init__(self):
self.engine = Engine()
def start(self):
print("Car starting...")
self.engine.start()
my_car = Car() # Car starting...
my_car.start() # Engine started