A pageview is like when you open a book and look at a page. When you visit a website, like YouTube for example, and click on a video to watch, that is a pageview. It means you are looking at a page on the website. It's like turning to a page in a book and looking at what's on that page.
When a website keeps track of how many people are looking at its pages, it is counting the number of pageviews. It's like counting how many people are looking at different pages in a book. This is important because it helps the website know how popular its pages are and which ones people like to look at the most.
Websites use pageviews to learn about what people are interested in and improve their website based on that information. For example, if they see that a lot of people are looking at a certain page, they might decide to create more pages like that because people seem to like them. It's kind of like if you have a favorite book and you tell your parents to buy more books from the same series because you really enjoy them.
So, a pageview is like opening up a book and looking at one page, and websites use it to see how many people are looking at their pages and decide what kind of pages people enjoy the most.