When you install Windows 10 a new on a PC or run it for the first time if it comes pre-installed with the computer, you create the first user account during that process.
This is the main account on the system and configured to be an administrator account by default, but it is not the only one that is created during that process.
Windows 10 creates two additional user accounts automatically which are both inactive by default.
Guest accounts are severely limited as it is not possible to install software or hardware, or modify system settings.
The second is the administrator account. It is also inactive by default and needs to be enabled before it can be used. While not required at all, it is often used for troubleshooting or administrative purposes when it is enabled.
A core difference between the administrator account of the user and this built-in administrator account is that the former receives UAC prompts while the latter does not. The user account is an unelevated administrator account while the built-in administrator account an elevated one.
To enable the Windows 10 administrator account do the following in the Command Prompt as an Administrator by pressing Windows Key+X and choosing 'Command Prompt (Admin)' :
The administrator account is active now which means that you can sign in to the system using it. It is not password protected by default which means that anyone with access to the system can use it to sign in to it.
It is highly recommended to protect it with a password. This can also be done on the command line:
To disable accounts at any time, use the following command: