This article discusses the importance of Breach and Attack Simulation (BAS) in cybersecurity. It highlights the problem of assumptions and the false sense of security they create, as well as the shortcomings of traditional testing methods. BAS is described as a method of rigorously validating defenses before real attacks occur, and it is emphasized that BAS should be an ongoing process that adapts to the evolving threat landscape. The article also explains the mechanics of BAS, including how it simulates cyberattacks and provides analytics and insights for improving defense strategies. It provides steps for integrating BAS into an organization’s cybersecurity strategy, including tailoring BAS to specific needs, creating a simulation schedule, applying insights from the simulations, and measuring and refining the process. The article concludes by promoting Picus Security as a pioneer in BAS technology and encouraging organizations to proactively strengthen their cyber defenses.