JavaScript is an open-source & most popular client-side scripting language which refers to scripts that run within your web browser and are supported by all browsers. JavaScript is used mainly for enhancing the interaction of a user with the webpage. JavaScript is designed to add interactivity and dynamic effects to web pages by manipulating the content returned from a web server. JavaScript is a must for students and working professionals to become great Software Engineers especially when they are working in Web Development Domain. It is a lightweight, interpreted programming language that is designed for creating network-centric applications. It is complementary to and integrated with Java and very easy to implement because it is integrated with HTML. It is open and cross-platform. In this tutorial, we have covered all the topics that will give you a headstart to work in this field, such as, What is JavaScript, Where to write, Loops in JavaScript, and much more.