Answer: In general, a passport serves as an internationally recognized document for domestic citizens to enter and exit the country and to prove their nationality and identity abroad. After the holder completes the visa and entry procedures, the passport submitted by them can be used as an "identity certificate" for foreign parties, without the need for notarization or authentication procedures. However, if the passport provided by a foreign party who has not completed the visa and entry procedures cannot prove their legal identity, they should require the foreign party to notarize and authenticate the passport provided by them with reference to extraterritorial evidence, or handle other procedures that are sufficient to prove their legal identity in accordance with the regulations of their country of nationality.