wireless is an emerging set of standards covering throughput, frequencies and security.
over time the evolution has led to better security (e.g. wpa1 -> wpa2), and throuput (more ariels and frequencies used).
in a way everyone thought 802.11n was going to amaze the world, but because it was a loose set of standards not all compatible devices have all features e.g. access point/laptop can be 802.11n but only have one ariel etc.
802.11ac essentially mandates combining multiple standards and frequencies to increase throughput.
once deployed at access point and client end the throughput advantages should be very good.
if you have ever used voice or video over wireless then the advantages will be obvious.
http://en.wikipedia.org/wiki/IEEE_802.11ac
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