the Javascript is the most popular programming Language in the world , especially in building and development the websites . 95% of the websites are used javascript in it's structure , big companies like Facebook , Google , Amazon , Paypal and Netflix used javascript to build it's own applications . As we know we use HTML to build the website structure , CSS for the presentation and javascript to make the website Dynamic because javascript makes the design interactive . where the user can interact with the wbsite . by javascript we can make animation for the images on our web page and also a part of the page can be updated by javascript . all that depends on a certain action the user will take on our web page.