Bitnami is a set of programs that work together to make it easier to run different types of websites, apps and servers. Think of it like a kit of parts that you can use to quickly build websites and programs. Each piece of the kit is called a "module" and each module is designed to help you in a different way. For example, one module will help you quickly create a website, another will help you host your website online and another will help you protect your website from hackers. Bitnami also includes tools to help you manage and monitor your website. So, you can use Bitnami to quickly and easily build a website or server without having to learn how to do it yourself.