Open Banking, driven by PSD2, is transforming banking from a closed, protected model into an open, platform-based ecosystem where customer data is shared securely with third-party providers via APIs. This shift creates both disruption and opportunity. Banks must move beyond compliance and rethink revenue models, customer segmentation, product strategies, and technology architecture. Revenue growth will depend on API monetization and service adoption. Customers will be served through highly personalised micro-segments, enabled by modular, API-driven offerings. Products and services will increasingly be co-created with fintech partners, while some banks may also act as aggregators or third-party providers themselves. Technologically, banks need API platforms, developer portals, sandboxes, and secure, partner-friendly architectures that balance openness with security. Open Banking is expected to create digital marketplaces that improve agility, innovation, and time to market. Ultimately, success in Open Banking hinges on delivering superior customer experience in a collaborative ecosystem.