In JavaScript, the concept of object background refers to the underlying structure and behavior of an object. Every object in JavaScript has a background that consists of its prototype, properties, and methods. Understanding the object background is crucial for effective programming as it allows developers to manipulate and interact with objects effectively. The prototype of an object defines the inheritance hierarchy, and properties and methods are inherited from the prototype. This allows for code reusability and the creation of complex data structures. By understanding the object background, developers can create efficient and maintainable code. Additionally, understanding the background of built-in objects such as arrays and functions can help developers utilize them effectively. In conclusion, understanding the object background is essential for proficient JavaScript programming.