What is the difference between builds 14267 and 10586 - the same?

As a newbie, I wondered why there are postings about 14000 and 10000 builds. Please explain
Fast ring is bumped to 14322 version where as production preview is still in 10586. 14322 is not stable, has many issues, apps crashes. 10586 is stable and preferable for daily driver device.
 
As a newbie, I wondered why there are postings about 14000 and 10000 builds. Please explain

There are two different branches with two different working teams, build 10586 is called Threshold and it's the official, and 14XXX is Redstone and it's te experimental for the future improvements, that's all. Two different Windows 10
 

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