Tex. Ins. Code § 3503.001

In this subchapter, "obligation" means a bond, undertaking, recognizance, guaranty, or other obligation that is by law or by a charter, ordinance, or rule of a municipality, board, body, organization, court, or public officer required or permitted to be made, given, tendered, or filed to guarantee the performance of an act, duty, or obligation or the refraining from an act.