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Object-oriented programming (OOP) is a programming paradigm that is based on the concept of objects. In OOP, objects are instances of classes, which are templates that define the properties and behaviors of objects.

Methods are functions that are defined within a class and are used to perform actions on objects of that class. Methods are associated with objects and can access the data that is stored in the object.

There are different types of methods in OOP:

1. Instance methods: These methods are defined within a class and are associated with the instances of that class. They can access and modify the instance variables of the class.

2. Class methods: These methods are associated with the class rather than the instances of the class. They can access only the class variables and cannot modify the instance variables.

3. Static methods: These methods are also associated with the class rather than the instances of the class. They are not related to any particular object and can be called without creating an object of the class.

Methods can also have parameters, which are variables that are passed to the method when it is called. The parameters can be used to modify the behavior of the method or to provide input data for the method to operate on.

In summary, methods are an essential part of OOP and are used to define the behaviors of objects. They are defined within classes and can be used to perform operations on the data stored in objects.