What is JavaScript?
It is Brendan Eich who developed JavaScript while at Netscape, working on projects affectionately called Mocha and LiveScript. He later standardized them as ECMAScript. Today, it is a high-level, object-oriented, and event-based language that requires an internet engine to run, for example, V8 in Chrome, SpiderMonkey in Firefox, and JavaScriptCore in Safari. In its bare-minimum form, JavaScript updates and alters the contents of a web page using the Document Object Model (DOM) and listens to user actions like mouse clicks, hovers, submits, and performs background network requests (AJAX) or modern ones using the fetch API call.
Related terms: client-side scripting, AJAX, ECMAScript, DOM.