Netflix employs fault injection and chaos engineering to enhance the resilience of its complex microservices architecture, crucial for maintaining its streaming service. By intentionally introducing faults and simulating failure scenarios, such as those using their Simian Army tools like Chaos Monkey, Netflix gains critical insights into system behavior under stress, allowing engineers to design recovery mechanisms and build a fault-tolerant infrastructure. This approach not only prevents cascading failures but also ensures that disruptions remain isolated, fostering confidence among engineers to innovate without fear of widespread system failure. Additionally, Netflix's FIT platform allows for automated, large-scale fault injection, ensuring robust testing of their distributed systems while minimizing adverse impacts. The combination of these strategies contributes to a scalable, resilient architecture that supports Netflix's commitment to providing uninterrupted service, even during unexpected spikes in demand or component failures.