No, it's not. A discount saves you money at the time of purchase. For example, a $100 product with a 10% discount will cost you only $90. A cashback offer gives you money after you've made the purchase. For example, you'll pay $100 for the same $100 product with a 10% cashback offer, and then you'll get $10 back at some point (usually 30-60 days after the purchase).