TikTok's business model is deceptively simple on the surface — sell ads against attention — but the mechanics underneath are unlike anything else in digital media. The company monetizes a behavioral loop: users open the app expecting to be entertained without effort, the algorithm delivers, and advertisers pay to insert themselves into that stream of passive consumption. The difference between this and, say, Google's model is intent. Google users are looking for something specific. TikTok users aren't looking for anything. They're waiting to be shown something they didn't know they wanted. That distinction matters enormously for advertisers, because it means TikTok can create demand rather than merely capture it. The advertising business is the dominant revenue engine, generating the vast majority of an estimated $39 billion in global revenue for FY2024. Brands buy through TikTok Ads Manager using auction-based CPM and CPC bidding across formats including in-feed video ads, TopView takeovers (the first thing users see when opening the app), Spark Ads that amplify organic creator content, branded hashtag challenges, and increasingly sophisticated performance advertising with conversion tracking and dynamic product ads. U.S. CPMs run significantly higher than Southeast Asian or Latin American markets, which is why America accounts for an estimated 65-70% of TikTok's ad revenue despite representing a fraction of its user base. TikTok Shop is the second act, and it's the one that should worry Amazon. Launched in the U.S. In September 2023, Shop integrates product discovery, creator-led reviews, live shopping broadcasts, affiliate commissions, and in-app checkout directly into the entertainment feed. The model is imported from Douyin, where live commerce already generates hundreds of billions in gross merchandise value annually in China. The Western version is earlier but growing fast — users can buy a product without ever leaving the video that introduced them to it. TikTok takes commissions on transactions, charges merchants for storefront tools, and earns affiliate fees when creators drive sales. Then there's the creator economy layer. TikTok LIVE lets creators earn through virtual gifts from viewers — a model that prints money in Asian markets and is growing in the West. The Creator Marketplace connects brands with influencers for sponsored content deals. Subscription features let fans pay creators directly. None of these individually rival the ad business, but collectively they keep creators producing content, which keeps users watching, which keeps the ad machine fed. The cost structure is asset-light compared to hardware companies but heavy in three areas: content delivery infrastructure (serving billions of video streams daily), trust and safety operations (moderating content across 150+ markets in dozens of languages), and the recommendation algorithm itself (which requires constant retraining on petabytes of behavioral data). ByteDance employs over 100,000 people globally, with a significant portion dedicated to TikTok operations. The unit economics work because of one architectural choice: the algorithm doesn't need users to build follower networks to generate engagement. That means a new user is valuable from day one — they'll watch content immediately, generate behavioral signals immediately, and see ads immediately. There's no empty-feed problem. No onboarding friction. No need to find friends first. That's why TikTok's engagement per session stays high and why advertising inventory density exceeds what competitors can achieve with social-graph-dependent feeds.