A scroll popup, also known as a popin, is a type of online advertisement or notification that appears on a webpage and is triggered by the user scrolling down the page. Unlike traditional popups that appear immediately upon opening a webpage, scroll popups are designed to appear when the user has scrolled a certain distance down the page, making them less intrusive and more user-friendly. These popups often contain promotional messages, special offers, or important information that the website wants to bring to the user’s attention. Scroll popups are a popular marketing tool for businesses as they have a higher chance of being noticed by users and can help increase website engagement and conversions. However, they should be used sparingly and strategically to avoid annoying or overwhelming the user.