What is Intel's "Express chipset"? What's the difference?

Vox

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Aug 9, 2012
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I was trying to get some google results about this silly question without success.

I'm about to buy a mobo for my new LGA1151 g4560 Kaby Lake processor and it came up that there are 2 versions of (straightly) supported chipsets (B250, H270, Z270, Z370, etc): normal (mainstream) and Express.

At first I thought this is something related to size (microATX or ATX) but it turned out to be false. There are common ATX sizes with Express chipsets.

So what's the difference between a B250 chipset and a B250 Express chipset?
 
Solution
All of those are "express" chipsets (have PCIE express connectivity).
There's no such differentiation as Z370 express chipset and Z370 non-express chipset.

If "express" keyword is omitted, then that's just for shortness.