Useful in various situations
How to Create a Guest Account in Windows 10
One of the most important rules of Windows 10 user management is to use a secure password for your account. You shouldn’t share your password with other PC users, especially if they have their own Microsoft accounts. If they don’t, you can set up Windows 10 without a Microsoft account if they’ll be using your PC a lot.
For guest users, you probably don’t want to go through the hassle of setting up a whole new user account every time. What you can do instead is set up a special Windows 10 guest account. This account has limited access to settings, but allows users to run already installed software and access the internet.
Previous versions of Windows offered a special guest account as a standard feature. This was back when portable devices like smartphones and tablets weren’t a reality yet, so sharing your PC with friends or family made more sense.