Please help a newcomer to Autocad 3-D

Can someone please tell me the difference between a polyline and a region? Why is it that I am unable to extrude a simple drawing after
making it a polyline with the pedit command? Thank you, G. De Angelis
snipped-for-privacy@cox.net
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It needs to be a closed polyline.
wrote:

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and you can't have lines that intersect (or are actually copies in the same location)
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