Diligence is the use of care or persistence in performing duties; thorough attention to a matter; heedfulness; assiduity. Diligence is the opposite of negligence.
Due diligence is the use of reasonable care ordinarily required by the circumstances. In civil law systems, due diligence is a duty analogous to reasonable care in common law systems.
[Last updated in June of 2021 by the Wex Definitions Team]