Final answer:
A failover cluster is a type of server cluster where services can fail over from downed servers to functional servers.
Step-by-step explanation:
In a failover cluster, services can fail over from downed servers to functional servers. A failover cluster is a group of two or more servers that work together to provide high availability and scalability of applications and services. When one server fails, the services running on that server automatically fail over to another server in the cluster, ensuring uninterrupted service.