An Overview of How JavaScript Is Interpreted and Executed

This article explains the nature of JavaScript as a programming language. JavaScript is described as an interpreted and just-in-time compiled language, meaning that it does not translate the entire code into machine language before execution but instead translates code quickly as needed during runtime. Initially, JavaScript was designed to run solely in web browsers, but its use has expanded with the introduction of Node.js, enabling it to execute on servers as well. This shift has considerably broadened JavaScript’s applications beyond client-side scripting to full-stack development. The article gives a concise introduction to JavaScript’s operational model and its evolution from a browser-only language to a versatile server and client-side tool.