Sapper is a tool that helps you build web applications (like websites and web apps) with a lot less work. It's like a helper who does a lot of the boring stuff for you!
When you use Sapper, you don't have to worry about how your website or web app looks or how it works behind the scenes, because Sapper helps you with that. It's like a magical toolbox that gives you all the things you need to build your web app, without you having to do a lot of work.
Sapper uses a programming language called JavaScript, which is a type of language that computers can understand. But, you don't have to worry about that either – Sapper helps you with the JavaScript stuff too!
So, imagine you want to build a really fancy website. You want it to have cool animations, lots of pages, and even a way for people to log in and save their information. Without Sapper, you would have to spend a LOT of time writing code to make all of that happen. But, with Sapper, you can use some pre-made code and tools to save time, and focus on making your website look the way you want it to.
In short, Sapper is a helpful tool that saves you time and helps you build cool websites and web apps without having to know all the nitty-gritty details of how it works.