HP NonStop is a high-availability computing platform designed for businesses that require continuous operation and minimal downtime. It is known for its fault-tolerant architecture, which ensures that if one component fails, others can take over seamlessly, allowing critical applications to run without interruption. The system is widely used in industries such as finance, telecommunications, and retail, where reliability is essential. HP NonStop supports various applications and databases, making it a versatile choice for organizations that need to process large volumes of transactions while maintaining high performance and security.