System Availability refers to the measure of a system's operational performance and readiness for use. It indicates the percentage of time a system is fully functional and accessible to users. High availability is crucial for businesses, as it ensures that services remain uninterrupted, minimizing downtime and enhancing user satisfaction. Factors affecting System Availability include hardware reliability, software performance, and network connectivity. Organizations often implement strategies like redundancy, regular maintenance, and monitoring to improve availability. By maintaining high levels of availability, businesses can ensure that their systems meet user demands and support critical operations effectively.