It is a real challenge to add to the many superb posts in this thread, but I can't resist giving it a shot (unblocked, I hope).
First, the adjective most heavily relied on by journalists and analysts to describe the UConn defense is "swarming." Which pretty well captures the essence of the relentless pressure, trapping, and the "in-your-face" attitude of Husky defenders.
Second, a technical point. When opponents have the ball out on the wing (vicinity sideline about even with imaginary extension of free throw line), UConn defenders always guard very closely and slightly overplay to one side to prohibit their opponent from dribbling toward the center of the court. That player
may go toward the basket via the baseline, but our defender knows that Help Is On The Way from the weakside (Morgan, Stewie, etc.).
Third, UConn defenders have an uncanny knack for doing a "Gotcha now!" trap of any opponent who commits the *cardinal sin of picking up her dribble in one of the corners in the forecourt (sideline and either baseline or half-court line). That mistake = lights out!
Finally, that more recent wrinkle of having Stewie simulate a windmill on steroids as she harrasses the inbounds passer or, in their backcourt, those "itty-bitty guards" (thanks, Nan).
*not a reference to either Stanford or Louisville.
