What's the difference between ASYNC_NETWORK_IO or NETWORK_IO

I ran the query by both and local by SQL Server 2012, then saw the the most consumed time waittype is
NETWORK_IO , so based on the article below, it means the time spent in network and client application.
My question is what's the difference between ASYNC_NETWORK_IO or NETWORK_IO? when the NETWORK_IO occurred, and when ASYNC_NETWORK_IO occurred?
http://blogs.msdn.com/b/karthick_pk/archive/2012/07/27/async-network-io-or-network-io.aspx
Please click the Mark as Answer button if a post solves your problem!

here's a blog post from sqlskills.com which maps wait types to extended events:
https://www.sqlskills.com/blogs/jonathan/mapping-wait-types-in-dm_os_wait_stats-to-extended-events/
According to this NETWORK_IO AND ASYNC_NETWORK_IO
map directly, so they're the same thing.
wait_type in sys.dm_os_wait_stats
map_value in sys.dm_xe_map_values
ASYNC_NETWORK_IO
NETWORK_IO
BROKER_TASK_STOP
SSB_TASK_STOP

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