Which feature allows for the movement of virtual machines between different hosts without service disruption?

The feature that enables the movement of virtual machines between different hosts without service disruption is vSphere vMotion. This technology allows for the live migration of running virtual machines from one physical server to another with no downtime, ensuring that applications remain available during the transition.

vSphere vMotion operates by transferring the virtual machine's memory and system state over the network while it continues to run. As the data is transferred, the host where the VM is running sends updates to the new host. Once the majority of the state is migrated and there is minimal data left to send, the VM briefly interrupts its operation to make the transition seamless, thus maintaining service accessibility.

Using vSphere vMotion is particularly beneficial when performing maintenance on physical servers or balancing workloads across a cluster, ensuring a smooth user experience. Other technologies may involve different types of transfers or require downtime, making vSphere vMotion a vital tool in maintaining high availability in virtualized environments.