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Most of the web content today is interactive and includes menus, slideshows, forms, and and attractive user interfaces. To enhance user experience and add dynamic nature to the website, web developer by scripting languages and JavaScript is one of the most famous to achieve this features. It lets developers to make websites that interact with the user and vice versa. JavaScript was designed to add interactivity to HTML pages. It is a scripting language i.e. lightweight programming language. A JavaScript is usually embedded directly in HTML pages. JavaScript is an interpreted language (means that scripts execute without preliminary compilation). Converts code to executable format each time it runs. Converted when browser loads a web document. JavaScript is supported by all major browsers. JavaScript is the language of the web. We can use it to add dynamic behavior, store information, and handle requests and responses on a website.