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JavaScript is a programming language that is used to add interactivity to web pages. It is the most widely used scripting language on the web and is used to make web pages dynamic and interactive.

JavaScript was created in 1995 by Brendan Eich while he was working at Netscape. It is a high-level, object-based scripting language that is used to create dynamic webpages and web applications. It was created out of a need for an easier and more powerful way to build web applications.

JavaScript is a client-side scripting language, meaning that it is run in the user’s web browser instead of on the web server. This makes it faster and more efficient than server-side scripting languages like PHP or ASP.NET. JavaScript can be used to create interactive websites and web applications. It can be used to create animations, games, photo slideshows, and even dynamic webpages.

JavaScript is easy to learn and use. It is mostly used for front-end development, meaning that it is used to create the pages and interfaces that the user sees and interacts with. It is also used for back-end development, meaning that it is used to create the business logic and database layers that are used to store data.

JavaScript is used by millions of websites and web applications. It is the language of choice for many web developers and is used to create dynamic and interactive webpages. It is a powerful language that can be used to create complex applications and websites.

This is an example of a simple JavaScript code

var name = "John"; 
alert("Hello " + name);