“One of the more popular methods is to prompt the lightbox when a user’s cursor scrolls off the webpage and into the browser: It’s called an exit overlay. The benefit of exit overlay usage is that it doesn’t interrupt the middle of a user’s browsing experience and instead waits for the user to signal that they are done browsing. The con is that this doesn’t work on mobile devices since there are no cursors.”
You can use a lightbox to grow your email list 5 to 10 times faster than using traditional email signup fields on a website. While many digital marketers think of them as a nuisance to conversion, these pop ups help guide users to a specific call-to-action.