Have you ever been browsing a website or using an app, and just as you click to go to the next page, a full-screen message pops up? That’s an interstitial. It’s a page that appears between two other pages of content. Think of it like a commercial break. You’re watching a show, it ends, and before the next part begins, a commercial fills the screen. Interstitials are the web's version of that.

These pop-ups completely take over the screen for a short period, pausing your journey from point A to point B. They are designed to grab your full and undivided attention.

The main purpose of an interstitial is to deliver a focused message without the distractions of other content on the page. Because they command the entire screen, they have a high visibility rate. This makes them popular for a few key uses.

For advertisers, it's a way to ensure their ad is seen. For a website owner, it might be a way to announce a big sale or ask users to subscribe to a newsletter. In each case, the goal is to present a single, clear call to action before the user continues to their intended destination.

Interstitials have a complicated relationship with user experience. On one hand, they can be effective. When an app offers you a discount code just as you're shopping, that interstitial can feel helpful. It's relevant and provides value.

On the other hand, they can be highly disruptive. They interrupt the user's flow, forcing them to stop and deal with the pop-up before they can do what they wanted to do. An unexpected, irrelevant, or hard-to-close ad can be frustrating and may cause people to leave the site or app altogether.

Ultimately, the impact of an interstitial depends on its context and design. When used thoughtfully, it can be a powerful communication tool. When used carelessly, it becomes an obstacle that harms the user's experience.