HA (High Availability)

High Availability (HA) refers to designing systems so that they remain operational and accessible even if some components fail. It involves using redundant hardware, software, or paths to ensure continuous service, minimizing downtime. Think of it like having backup parts or routes—if one fails, another takes over seamlessly. HA is essential for critical services like banking, healthcare, or online platforms, where staying online is crucial. The goal is to maximize uptime and reliability by proactively preventing service disruptions through intelligent, resilient system architecture.