Fault-tolerant applications are designed to continue functioning even when some components fail. They achieve this by incorporating redundancy, error detection, and recovery mechanisms. This ensures that the application can handle unexpected issues without crashing or losing data, providing a more reliable user experience. These applications are crucial in critical systems, such as those used in healthcare, finance, and aviation. By maintaining operational integrity despite failures, fault-tolerant applications help prevent costly downtime and enhance overall system resilience. This reliability is essential for maintaining trust and safety in environments where errors can have serious consequences.