Your Yandex ID
Many Yandex services are only available with an account. Without one, you can't use such products as Yandex.Mail, Yandex.Disk, and Yandex.Webmaster.
Yandex ID is a single Yandex account. You can use it to access all Yandex products.
If you need to change your password or last name, you only need to do it once in Yandex ID on the Account management page. The changes will automatically apply to all services. Here you can link your phone number to Yandex ID and enable two-factor authentication.