This is the 3570th most frequent Japanese word.
認証
"認証" means "authentication" or "certification."
認証 refers to the authentication process in the system.
このシステムでは、ログインするために認証が必要です。
This system requires authentication to log in.
認証 in this context means the official certification of documents.
私の資格証明書が正式に認証されました。
My credentials have been officially certified.
認証 indicates the approval or endorsement of the product's quality.