Frontend monitoring is essential for maintaining the performance and user experience of web applications, focusing on the client-side interface that users interact with. It allows developers to swiftly identify and resolve errors, preventing downtime and customer dissatisfaction. This process involves tracking network request issues, JavaScript errors, and user experience bugs, helping developers understand application performance and user interactions. Several tools are available for frontend monitoring, such as Highlight, Sentry, Rollbar, Site24x7, and Pingdom, each offering unique features to detect, report, and manage errors in real time. These tools enable developers to prioritize bug fixes, maintain application availability, and ultimately focus more on building and improving apps rather than constantly troubleshooting issues.