Uptime refers to the amount of time a system, service, or device is operational and available for use. It is often expressed as a percentage, indicating the ratio of operational time to total time. For example, if a server is running for 23 hours in a day, its uptime would be approximately 95.8%. High uptime is crucial for businesses, especially those relying on technology like websites or cloud services. Maintaining high uptime ensures that users can access services without interruptions, which can enhance customer satisfaction and trust in the brand.