It really is... can you imagine what would the world be if there was no data centers?
Websites, at this scale... we wouldn't know them like we do today.
I actually didn't see the whole mention of Tiers, in 5 pages, but there are 4 tiers for Datacenters. The higher the tier, the more expensive and demanding it is, but also guarantees are greater.
It's used to improve speeds to the enduser - multiple simultaneous uses require multiple paths for data to freely flow, don't they? That's what RAID is for. That, and also for backups.
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