What is the difference between host objects and native objects?

Native Objects, also known as built-in objects, are part of the standard JavaScript language (ECMA-262). They exist in any JavaScript environment, whether it's a browser or a server environment. These objects include String, Number, Boolean, Array, Object, Function, Date, RegExp, Math, Error. They provide fundamental functionality and data types.

Host Objects are provided by the JavaScript runtime environment (host). In the context of a web browser, host objects include those related to the DOM (Document Object Model) and BOM (Browser Object Model). Examples include window, document, navigator, XMLHttpRequest, DOM elements (<div>, <p>, etc.). In a server environment (e.g., Node.js), host objects are those provided by the Node.js environment (e.g., process, fs). Host objects vary depending on the runtime environment.

The key difference lies in their origin and availability: native objects are an integral part of the language itself, while host objects are provided by the surrounding JavaScript environment.