In law, a resolution is a motion, often in writing[note 1], which has been adopted by a deliberative body (such as a corporations' board and or the house of a legislature).
Such a resolution, when certified by the corporation's secretary, gives assurance to the other side of the transaction that the sale was properly authorized.
Other examples include resolutions approving the opening of bank accounts or authorizing the issuance of shares in the corporation.
For example, the United States Congress declares war or proposes constitutional amendments by adopting a joint resolution.
The resolution is often used to express the body's approval or disapproval of something which they cannot otherwise vote on, due to the matter being handled by another jurisdiction, or being protected by a constitution.