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JavaScript is a scripting language owned by Sun Microsystems and first introduced in 1995 with the Netscape internet browser. JavaScript code is run locally in the user’s browser instead on a remote server, making this technology very reactive and responsive to user actions. It’s primary use is to enable functions embedded or included in HTML pages, the most common example is changing images or text color when the mouse cursor moves over them, and the most important function is without doubt the validation of web forms and data you have put in before submitting them to the server. In the case of our gothic shop, this would be the customer details or terms and conditions, for example.