Object-oriented programming (OOP) is a programming paradigm that uses "objects" – data structures consisting of datafields and methods together with their interactions – to design applications and computer programs.

Programming techniques may include features such as information hiding, data abstraction, encapsulation, modularity, polymorphism, and inheritance.

A type of programming in which programmers define not only the data type of a data structure, but also the types of operations (functions) that can be applied to the data structure. In this way, the data structure becomes an object that includes both data and functions. In addition, programmers can create relationships between one object and another. For example, objects can inherit characteristics from other objects.

Object-oriented programming (OOP) is a programming language model organized around "objects" rather than "actions" and data rather than logic.

In classic, procedural programming you try to make the real world problem you're attempting to solve fit a few, predetermined data types: integers, floats, Strings, and arrays perhaps. In object oriented programming you create a model for a real world system. Classes are programmer-defined types that model the parts of the system.

A style of programming that defines data as objects with attributes and methods that are applied to those objects, and which can be inherited by other objects.

Object-oriented programming (OOP) models a system as a set of cooperating objects.

Object oriented programming (OOP): a class of programming languages and techniques based on the concept of an "object" which is a data structure encapsulated with a set of routines which operate on the data. C++  and Java  are object oriented programs.