High Availability (HA)

High Availability (HA) refers to designing systems so they remain operational and accessible with minimal downtime, even if individual components fail. Think of it as having backup plans or redundant parts—if one part stops working, another instantly takes over to keep services running smoothly. This ensures critical applications or websites stay up and responsive, providing reliable service for users and businesses. HA is vital for environments where continuous access is essential, like online banking, healthcare systems, or emergency services.