The thank offering or sacrifice of thanksgiving (Hebrew zevakh hatodah זֶבַח הַתֹּודָה ) was an optional offering under the Law of Moses. This is also termed the "thanksgiving offering."
The Hebrew noun todah "thanksgiving" is derived from the Hiphil of the verb yadah (יָדָה) "to praise." In Psalm 107:22 and elsewhere no physical offering, only praise, is implied.