Due diligence is an investigation or audit of a potential investment to confirm all facts, such as reviewing all financial records, plus anything else deemed material. Due diligence refers to the care a reasonable person should take before entering into an agreement or a financial transaction with another party. When sellers perform a due diligence analysis on buyers, items that may be considered are the buyer's ability to purchase, as well as other elements that would affect the acquired entity or the seller after the sale has been completed.