PHP is a programming language designed to make websites dynamic and interactive. When you write PHP code, it runs on a server and then sends the result back to your browser as a normal webpage. This means users see your page, but they don’t see your PHP code, making it secure.

One of the coolest things about PHP is that it works on almost any computer or server and can connect to many kinds of databases, which are used to store lots of information. It’s also flexible, helping create websites that do things like check logins or remember user preferences.

PHP is friendly for beginners because it's easy to start writing basic scripts and also offers powerful features for experts. In its latest version, PHP is faster and has added some handy improvements, making it even better.

Overall, PHP is a favorite for many website developers because it's free and helps create everything from small scripts to large, bustling websites like WordPress.