Do you know how you turn the pages in a book? You use your fingers to lift up one side of the paper and then you move it over to the other side. That's what flipping a page means!
Now imagine you're reading a book on a computer or tablet screen. You can't physically touch the page like you do in a real book. Instead, you use your mouse or touchpad to click on a little arrow or swipe your finger across the screen to turn the page. It's like magic!
Different programs or apps have different ways to flip pages, but the idea is always the same - you're moving from one page to the next in a digital document. And just like in a real book, you can keep reading and flipping through pages until you reach the end of the story.