Definition: A purchase agreement is a contract used to transfer the ownership or sale of a business.

Definition: Asset Purchase Agreement (APA): An agreement by which a business sells some or all of its assets to an acquirer, typically structured as an asset purchase or asset sale. 

Definition: Definitive Purchase Agreement (DPA): The final agreement that is signed during the process of buying or selling a business that transfers the individual assets from the seller to the buyer.

Definition: Stock Purchase Agreement (SPA): A deal structure where the buyer purchases all of the stock of the target from the selling stockholders, often resulting in the target becoming a wholly owned subsidiary of the buyer. 

See Also: Representations & warranties.