Object-oriented programming (OOP) is a programming paradigm that is supported in Python. OOP is based on the concept of objects, which are instances of classes. A class is a blueprint that defines the attributes and behavior of an object. In Python, a class is defined using the "class" keyword, followed by the class name and a colon. The attributes of a class are defined as variables, and the behavior of a class is defined as methods. An object is created by instantiating a class, and can access the attributes and methods of the class. OOP in Python provides encapsulation, inheritance, and polymorphism. Encapsulation means that the attributes and methods of a class are hidden from outside access, and can only be accessed through the object. Inheritance allows classes to inherit attributes and methods from a parent class, and can be used to create more specialized classes. Polymorphism allows objects of different classes to be used interchangeably, as long as they implement the same interface. OOP is widely used in Python for software development, and can be used for a variety of applications such as GUI development, game development, and web development.