  The goal of this paper is to introduce some of the major ideas behind
extended topological quantum field theories with an emphasis on explicit
examples and calculations. The statement of the Cobordism Hypothesis is
explained and immediately used to classify framed and oriented extended two
dimensional topological quantum field theories. The passage from framed
theories to oriented theories is equivalent to giving homotopy fixed points of
an $SO(n)$ action on the space of field theories. This paper then constructs
extended two dimensional Dijkgraaf-Witten theory (also called finite gauge
theory) as an example of a two dimensional extended field theory by assigning
invariants at the level of points and extending up. Finally, it is concluded
that Dijkgraaf-Witten theory is the only example of an extended framed two
dimensional topological quantum field theory by showing that any field theory
is equivalent to Dijkgraaf-Witen theory for some cyclic group.
