Video Streaming Ads: Monetization Models and the Ad Insertion Pipeline

In a product manager interview, you are asked how advertising makes money for a video streaming service. Explain where ads fit among the ways a streaming service can charge for its content, and what happens behind the scenes when a show reaches an ad break: how the ad is chosen, delivered and played, and how the service gets paid for it. ```hint Follow the money and the stream Answer at two levels: the business model that decides who pays (the viewer, the advertiser or both), and the path a single ad break takes from a marker in the video to an ad on screen and a record that it was seen. ``` ### Clarifying Questions - Is this an on-demand library, live channels and events, or both? Ad breaks are marked differently in each. - Is the service free and fully ad-funded, or does it offer an ad-supported plan alongside an ad-free subscription? - Which devices carry most of the viewing: connected TVs, phones or browsers? That shapes how ads can be inserted. - Does the service sell its ads through its own sales team, through automated programmatic buying, or both? ### What a Strong Answer Covers - The main monetization models (subscription, ad-supported, pay per title, and hybrids) and the trade-offs that lead a service to choose ads. - The ad delivery flow end to end: break markers, the ad request, ad decisioning, insertion into the stream, playback and tracking. - Client-side versus server-side ad insertion, and why the choice matters for viewer experience, ad blocking and measurement. - Ad formats and the industry standards used to deliver and measure video ads. - The revenue levers (watch time, ad load, fill rate, price per thousand impressions) balanced against viewer-experience guardrails. ### Follow-up Questions - How would you set the number of ad minutes per hour without hurting retention on the ad-supported plan? - Advertisers say they cannot verify that their ads were actually seen when ads are stitched into the stream on the server. How would you respond? - An ad request times out in the middle of a break. What should the viewer experience be?