Browser-in-the-Browser (BitB) attacks are an evolution of phishing techniques that use realistic fake browser windows to harvest credentials and second-factor codes in real time. Unlike traditional phishing, BitB doesn’t redirect the user away from the legitimate domain; instead it simulates a login popup inside the browser page, making detection by users and some security controls more difficult. This presentation will demystify the mechanics, demonstrate a practical keep-simple proof of concept, and present actionable defenses.