Whats a Catalina?

Catalina or Cat- 

Look familiar?  These are the coupons/ads you used to throw away.   They can be high value coupons you can use on your next order.  Read them closely, it might say"$5.00 courtesy of Kraft good for your next purchase".  Walgreens, Fred Meyer and Albertsons are the stores you will find cats. 
Thanks The Krazy Coupon Lady for the pic!