Interstitial ads can significantly impact website engagement. These ads appear as full-screen popups while users navigate between pages. They capture attention because of their size and visibility. However, they can be intrusive if not used wisely. Users may find them annoying if they interrupt the content experience too frequently. On the other hand, when used strategically, interstitial ads can drive higher conversion rates. They can lead to more clicks if placed at natural stopping points in the user journey. The key is balancing user experience with monetization goals to maintain engagement without causing frustration.