What does a CEO actually do all day? In this episode of Explain It to a Teenager, teen host Jensen Muller sits down with Mark Zagorski, CEO of DoubleVerify, the company fighting digital ad fraud across platforms like TikTok, Meta, ETC. From smart fridges running fake ads (seriously) to bots trying to scam billions of dollars, Mark breaks down how his team keeps advertising real, relevant, and safe—and why it matters to everyone who uses the internet. He continues to talk about the trials and tribulations of being a CEO in a public company that saves people tens, if not hundreds, of millions of dollars, and how every day is different.