Which vSphere feature provides continuous availability, allowing users to protect any virtual machine from a host failure with no loss of data or connectivity?

vSphere Fault Tolerance is designed to provide continuous availability for virtual machines by safeguarding them against host failures. This feature allows a virtual machine to run on a primary host and have an exact secondary copy on another host, without any downtime. In the event of a host failure, the secondary VM immediately takes over operations, ensuring there is no loss of data or connectivity.

This feature effectively allows for real-time data protection while maintaining uninterrupted service to users, making it particularly critical for applications that require high availability. By providing this seamless failover, Fault Tolerance enables environments where uptime is vital, such as in production systems running critical applications.

In contrast, while options like vMotion and Enhanced vMotion Compatibility focus on migrating virtual machines without downtime or compatibility issues during hardware upgrades, they do not provide the continuous availability features that Fault Tolerance does. On the other hand, vSphere High Availability (HA) does offer recovery from host failures, but it can involve some downtime as it restarts the virtual machines on an available host instead of providing uninterrupted service, which differentiates it from Fault Tolerance's capabilities.