HA and DRS

Can anyone provide a beginners management freindy interpretation on the difference between HA on vmwaere clusters and DRS on vmware clusters. Do you use HA and DRS, or typically one or the other, what does each do? Do they work in tandem?
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pma111Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
VMware HA (High Availability) - Availability Management for Virtual Machines - Maintains VM uptime, by ensuring, if a Host fails, VMs are started automatically on remaining ESXi Hosts in the Cluster.

http://www.vmware.com/uk/products/vsphere/features-high-availability

VMware DRS (Distributed Resources Scheduler) - Load Balancer of Virtual Machines between ESXi Hosts. - Maintains equal performance across ESXi Hosts in the Cluster, by automatically moving virtual machines between ESXi Hosts in real time.

http://www.vmware.com/uk/products/vsphere/features/drs-dpm.html
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pma111Author Commented:
So you typically enable both on clusters, not one or the other, as they are doing completely different things - and dont really work in tandem?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
They are different functions, and are generally enabled together, if you are licensed for VMware HA and DRS.
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