Jupyter is like a magic notebook that helps you write and run computer programs. You can use it to do all sorts of fun and interesting things like making graphs and charts, analyzing data or even creating your own games!
Think of it like a special kind of paper that has the ability to 'run' the code you write on it, so you can see the results of your work right away.
In Jupyter, you can write words and sentences, just like in a regular notebook, but you can also write computer code in a special coding language called Python. When you type in some Python code, Jupyter 'runs' it and then shows you the result right there in your notebook.
It's really cool because you can see how your code works right away and change it as needed. This is great for learning programming because you can experiment and see what happens when you try out different things.
Jupyter is named after three programming languages - Julia, Python and R - but it can work with many other languages too. It's free to use and lots of people use it, from scientists and students to business people and hobbyists.