A web application is like a tool or a game you can use on the internet without needing to install anything on your computer. It's a software program that lives on a powerful computer called a web server. Instead of downloading and installing it, you can simply open a web browser (like Chrome or Firefox) on your computer, phone, or tablet, and visit a website to use the application. It's a bit like going to a playground with your own toys. The toys (the web application) are already there, and you can start playing with them as soon as you arrive on the website. Web applications can do all sorts of things, like letting you send emails, play games, or even manage your finances, all through your web browser. They make it easy to do useful or fun things on the internet without needing to clutter up your device with lots of software.