ACCEPTANCE DATE: ("Acceptance Date"). SELLER'S INFORMATION: Seller's Signature: Seller's Name (print):.1.1 Agreement of Purchase and Sale. 3. A sales agreement is used to describe and track the exact details of quantity and cost of purchasing or selling goods, services, or real estate. I'm gonna break down all the terms and conditions so you can understand what it means and we're gonna fill that out so you can have a real-life example of it.