A notarized translation is a translation accompanied by a sworn translator affidavit signed before a licensed notary public. The notary verifies the translator's identity and witnesses the affidavit, then affixes their seal and signature to the translated document. The result is a translation with an additional layer of formal authentication beyond a standard certified document translation.
Notarized translation is required by some US courts, certain government agencies, particular school districts, and many international document legalization chains. It is not always required for USCIS immigration submissions: a certified translation usually suffices for immigration. Always confirm the specific requirement with the receiving authority before ordering.