Side rail advertisements are a brand-new AdSense ad style that Google has introduced. When a customer views your website on a widescreen device, like a desktop computer, side rail adverts are stuck to the sides of the page.
Google wrote, “Today, we’re announcing a new ad format called side rails. Side rails are ads that stick to the sides of your pages when they’re viewed on widescreen devices, such as desktops.”
After December 13, 2022, side rails will automatically start to appear on your website for those who have already enabled anchor ads, according to Google.
Want no side rail advertisements? Then, in the AdSense console’s Auto ads settings, you can disable this option: