Application failure occurs when a software program does not perform its intended functions, leading to errors or crashes. This can happen due to various reasons, such as coding bugs, compatibility issues with the operating system, or insufficient system resources. When an application fails, it can disrupt user experience and productivity. To address application failure, developers often conduct debugging and testing to identify and fix the underlying issues. Users may also need to update their software or hardware to ensure compatibility. Regular maintenance and monitoring can help prevent future failures and improve overall application performance.