This is the 4890th most frequent Chinese word.
認證
Certification; authentication.
In this sentence, "認證" is used as a noun to indicate an official acknowledgment or certification of standards.
這款產品已通過國際品質認證。
This product has passed international quality certification.
Here, "認證" is used as a verb meaning 'to verify or authenticate,' indicating the action of ensuring the correctness of identity.
請認證自己的身份後再進行登錄。
Please verify your identity before proceeding to log in.
In this context, "認證" again functions as a noun, referring to approval or certification granted by an authority.