What are object prototypes in JavaScript?

Object prototypes in JavaScript refer to the internal mechanism that facilitates inheritance among objects. When an object is created, it can inherit properties and methods from its prototype. Every JavaScript object has a prototype, which is essentially another object from which it can inherit features.

This prototype linkage allows for the sharing of properties and methods across instances of objects, promoting code reuse and efficient memory usage. For instance, if you create a new object and access a property or method that does not exist on that object, JavaScript will automatically look up the prototype chain until it finds that property or method or reaches the end of the chain.

Choosing this answer highlights the central role of prototypes in JavaScript's object-oriented structure, showcasing how they enable inheritance and the dynamic nature of the language surrounding object manipulation. Other options discuss different concepts such as classes or specific methods, which do not encompass the broader idea of prototypes and their utility in creating a flexible and reusable object-oriented design.