A sales and purchase agreement (SPA) is a legal contract that outlines the terms of a transaction and binds an agreement between a buyer and seller. An SPA sets out the terms under which shares in a company are bought and sold, offering a structured framework governing the transfer of ownership.Here is a checklist of the key business and legal points that should normally be addressed in a vessel purchase agreement. A sale and purchase agreement is a legally binding contract between you and the seller. It sets out all the details, terms and conditions of the sale. A purchase agreement is a type of contract that outlines terms and conditions related to the sale of goods. The Sale and Purchase Agreement (SPA) sets out the agreed elements of the deal, includes a number of important protections for all the parties involved. An agreement of sale and a sale deed both are important documents for the transfer of property from seller to buyer. The Sale and Purchase Agreement (SPA) sets out the agreed elements of the deal, includes a number of important protections for all the parties involved. Using the following set of circumstances, each group will fill out the Purchase and Sale Agreement AND reference any other additional forms if needed.