What is the use for built-in graphic card on a "gaming" motherboard?

Many motherboards marketed as "gaming" has an integrated Intel graphic cards. Examples are this ASUS motherboard and this Gigabyte motherboard but these are just a couple of many. Note the "Gaming" word in their respective names.

Now I understand, that if you want to build a gaming PC most likely you would opt for Nvidia or Radeon. This is because integrated video do not have a chance to compare with higher end Nvidia/Radeon offerings. Correct me if I'm wrong.

I understand that putting in an integrated graphics into a motherboard increases it's cost. So there must be a reason why manufactures do this. It looks to me that putting an integrated GPU on a gaming MB is more of a rule rather than an exception.

I however cannot figure it out, what this integrated graphic is good for. Could you please explain what it can be used for (I'm guessing the intentional use, but any other possible uses too) given that for a gaming PC one is most likely to utilize an exteal GPU?

If you think any of my assumptions are wrong please point that out, since the whole thing does not make a lot of sense to me it is quite likely that it's my assumptions that are wrong somewhere.

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