What defines an object in object-oriented programming?

In object-oriented programming (OOP), an object is accurately defined as an instance of a class with specific data. This means that when a class—serving as a blueprint or template for creating objects—is defined, it outlines the properties (also known as attributes) and behaviors (methods) that objects created from it will have.

When you instantiate a class, you create an object that embodies the characteristics and functionalities specified in the class while holding unique values for its properties. For example, if there is a class called "Car," when you create an object from that class, it might represent a particular car with a specific make, model, and color. Each object can have its own state maintained through its properties, allowing for encapsulation and modularity in programming.

Thus, the concept of an object as an instance of a class with specific data is fundamental to understanding how OOP organizes and manipulates data and behavior in software design.