On the web, an interstitial webpage (or interstitial) is a web page displayed before or after an expected content page, often to display advertising or for regulatory reasons, such as to confirm the user's age (prior to showing age-restricted material) or obtain consent to store cookies. Most interstitial advertisements are delivered by an ad server.
Some people take issue with the use of such pages to present online advertising before allowing users to see the content they were trying to access.[1]