ESP - Extended Service Plan
AAR - Accessory Attachment Rate
These are things that are normally talked about in electronics, as you need to ask guests making purchases on electronic items such as cameras, TVs, ipads, etc if they would want to get an ESP for their item or if they would like to purchase an hdmi cable for a TV, a case for an ipad (those are examples of getting an attachment). Your store is scored on their AAR, so it is very important to keep it green.