Strong, hard-to-guess passwords are a necessary evil, and a downright nuisance on a PC that’s physically secure from intruders. For PCs running Windows 8.1 or Windows 10 that are connected with a Microsoft account or Azure Active Directory, you might want to set a PIN as an alternative to your password. That way, you can sign in quickly but still keep your system safe from prying eyes.
The PIN option is on the Accounts page in Settings, filed under Sign-in Options. The default is four digits, but you can make the pin longer to reduce the risk that someone will successfully break in by trying easy-to-guess combinations like your birthday or anniversary. You can always switch between PIN and password by clicking or tapping the Sign-In Options link on the screen where you enter your credentials.