An administrator account is a user account that lets you make changes that will affect other users. Administrators can change security settings, install software and hardware, and access all files on the computer. Administrators can also make changes to other user accounts.
When you set up Windows, you'll be required to create a user account. This account is an administrator account that allows you to set up your computer and install any programs that you would like to use.
To help make the computer more secure, this administrator account may be asked with a
UAC prompt to provide their password or confirmation before allowed to make changes that affect other users, or when running anything elevated (
Run as Administrator) since running elevated will allow it to have access to the entire computer.