What does this mean? src=cid

I was viewing the source code of an email which arrived with a picture.  What does this line mean and how do you interpret it?

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RoonaanConnect With a Mentor Commented:
When you see src="cid:......" this means that the image is attached to the email and stored in the mimepart with the id as identified after cid:.

When you see src="http://someurl" this means that the image is not included in the email, but is run of a website.

dalvaAuthor Commented:
I see.  I thought it was some kind of hex code.
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