Have you ever seen an ad on a website that pops up when you don't expect it and covers part of the screen? That's called a hover ad. It's like a little party trick that some websites use to get your attention. The ad hovers over the website, kind of like a ghost hovering over a house, and tries to get you to click on it by showing you something interesting or exciting. The website hopes that if you click on the ad, you might buy something or sign up for something they're offering. It's like a little game of catch that they want to play with you!