HTML Tidy is just like a helper that makes sure that the code that we write on our computer for a website looks good and organized. It checks our code to make sure everything is spelled correctly, all the codes we used are in the right place, and everything looks nice and clean. Just like how we clean our room or tidy up our toys, we need to tidy up our website code too so that it looks good and people can easily read and use it. HTML Tidy does that for us!