[ovirt-users] what difference between enterprise Linux hosts and oVirt Nodes ?

Enterprise Linux hosts (Enterprise Linux hosts) and oVirt Nodes (image-based hypervisors) are the two supported types of host. Hosts use Kernel-based Virtual Machine (KVM) technology and provide resources used to run virtual machines. But what difference between the Enterprise Linux Hosts and oVirt Nodes ? Please give me some explain in details,thanks!