Can anyone explain the DYNAMIC_CLASSes in a few terms?

Can anyone explain the DYNAMIC_CLASSes in a few terms?

References

Reference NO 1

http://stackoverflow.com/questions/15201116/can-anyone-explain-the-dynamic-classes-in-a-few-terms

Reference NO 2

http://www.linkedin.com/today/post/article/20130117141235-20017018-stop-using-these-16-terms-to-describe-yourself

Reference NO 3

http://en.wikipedia.org/wiki/Speed_reading

Reference NO 4

http://net.educause.edu/ir/library/pdf/eli7081.pdf

Reference NO 5

http://www.classism.org/about-class

Reference NO 6

http://support.illumina.com/faqs.ilmn

Reference NO 7

http://searchnetworking.techtarget.com/definition/dynamic-and-static

Reference NO 8

http://www.washington.edu/doit/TeamN/present_tips.html