Deltoid, Facebook's internal A/B testing tool, plays a crucial role in enabling rapid product development by allowing teams to assess the impact of new features on key metrics before launching. With numerous teams developing thousands of features simultaneously, Deltoid meticulously tracks statistical differences between test and control groups across core metrics such as daily active users, user retention, and engagement, as well as team-specific metrics like page views and interactions. This tool informs critical product decisions across various roles within the company. Pulse extends this capability beyond Facebook, offering data-driven decision-making for any feature under development, with visual representations of feature performance and statistical significance to guide product readiness. The summary also highlights the role of experimentation in shaping product strategies and mentions other companies like Spotify and Uber developing similar platforms. Additionally, it touches on CUPED, a method to enhance A/B testing efficiency, and references insights from experts on fostering a strong experimentation culture.