What Does JavaScript Do?

JavaScript is a programming language that is used to add interactivity and functionality to web pages. Here are some of the things that JavaScript can do:

1. Modify HTML and CSS: JavaScript can be used to modify the content and styling of web pages dynamically. This allows developers to create interactive and dynamic web pages that respond to user input.
2. Handle user events: JavaScript can be used to handle user events, such as mouse clicks, key presses, and touch events. This allows developers to create web pages that respond to user input and provide a more engaging user experience.
3. Validate form input: JavaScript can be used to validate user input in HTML forms, ensuring that users enter valid data before submitting the form. This helps to prevent errors and improve the user experience.
4. Add interactivity: JavaScript can be used to add interactivity to web pages, such as drop-down menus, image sliders, and pop-up notifications. This helps to make web pages more engaging and interactive for users.
5. Create animations and visual effects: JavaScript can be used to create animations and visual effects on web pages, such as fading in and out of content, sliding animations, and parallax scrolling. This helps to make web pages more visually appealing and engaging.
6. Retrieve and send data: JavaScript can be used to retrieve data from web servers and send data back to servers, allowing web applications to communicate with back-end systems and APIs.
7. Build web applications: JavaScript can be used to build web applications, such as single-page applications, which are web applications that load all of their content dynamically and do not require a page refresh. This provides a faster and more seamless user experience.

Overall, JavaScript is a powerful language that can be used to add interactivity, functionality, and dynamic content to web pages, making them more engaging and interactive for users.