JavaScript is a versatile language that can perform a wide range of tasks. Here are some of the main things that JavaScript can do: - Creating interactive web pages: JavaScript is often used to add interactivity to web pages, such as allowing users to interact with menus, forms, and other elements. - Validating form data: JavaScript can be used to validate user input on web forms to ensure that data is entered in the correct format and meets certain criteria. - Manipulating web page content: JavaScript can be used to dynamically manipulate the content of web pages, such as adding, removing, or modifying elements on the page. - Animating web page elements: JavaScript can be used to create animations and other visual effects on web pages, such as fading elements in and out, sliding elements across the page, and more. - Communicating with servers: JavaScript can be used to send and receive data from web servers, allowing web applications to load and save data dynamically without the need for a page refresh. - Creating web applications: JavaScript can be used to create complex web applications that mimic the functionality of desktop applications, such as email clients, document editors, and more.