What do American teens like to watch? It depends on the situation. Sometimes, they prefer a two-hour movie or a TV show. Other times, they want something short and funny online as a way to learn new things and connect with others. And, they increasingly rely on YouTube for this.

For those trying to reach young audiences, that means advertising on platforms that offer short-form videos. For content creators, it means exploring more opportunities in the digital space, which is what Viacom did with the launch of Viacom Digital Studios (VDS) in 2018. Behind flagship brands like MTV and Comedy Central, VDS video views grew to 5.9 billion last quarter, a 17% jump over the same period in 2018. Comedy Central’s Mini-Mocks series video “Brooklyn Ball Barber,” a funny, and fictionalized look into a mens’ nether region grooming service—has had the most views of any Viacom video this year.

Most teens say they’re more likely to watch a video all the way through if it’s funny, according to research by Viacom. But, the most-preferred videos among teens are music videos. Brevity also helps: 86% of teens claim the videos they watch are usually less than 10 minutes, and 55% say they’re less than five minutes. Additionally, more than four in 10 teens say that they think YouTube has the most entertaining content, according to the same research.

Overall, teenagers are looking to online video to meet their personal needs. If you’re looking to reach the elusive American teen, you can find them with their heads buried in their phones, absorbing content that is 10 minutes or less.

Here’s how teens use online video to tap into their needs: