This document provides an introduction to JavaScript and jQuery. It defines JavaScript as a scripting language used to create dynamic and interactive web pages and applications. It resides in the browser rather than on the server. JavaScript uses functions to organize code into well-defined, reusable tasks. Functions are executed when events occur or when called from other scripts. The document also defines jQuery as a JavaScript library that simplifies client-side scripting with HTML through its selector engine and methods. jQuery code is linked in the page head or an external file below CSS but above other scripts.
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