The act or process of creating an account for a service or website (user registration).
ユーザ登録を完了すると、確認メールが届きます。
Once you complete user registration, a confirmation email will arrive.
新しいサービスを使う前にユーザ登録が必要です。
You need to register as a user before using the new service.
ユーザ登録時にプライバシーポリシーへの同意を求められた。
You were asked to agree to the privacy policy during user registration.