Deals were similar to Groupon coupons - the customer pre-paid for the coupon and the business got a cut. Offers are more like normal coupons - they don't cost

Deals were similar to Groupon coupons - the customer pre-paid for the coupon and the business got a cut. Offers are more like normal coupons - they don't cost the customer anything, but the business has to (now) pay to advertise the coupon.