Feature adoption refers to how users discover and use the features available within a product, while advanced feature adoption focuses on familiarizing users with more complex features, developing a habit of using them, and getting to the full potential of the product. The feature adoption funnel includes four steps: Exposed, Activated, Used, and Used again. Key metrics for measuring feature adoption include the feature adoption rate, time-to-first key action, and average time spent using the feature. Combining user adoption and retention rates provides deeper insights into feature usage over time. To increase advanced feature adoption, use in-app messaging to grab users' attention, tailor feature onboarding flows to specific user segments, and gather feedback from users on the feature experience.