Quick Tip: Disable Automatic Login
When you first set up your Mac and create an account, it assumes you are using it at home and makes you an Administrator. It also sets itself up to log you in automatically to save time. For some people this isn’t suitable as the Mac may be in a public area or contain important information that you want to keep away from prying eyes.
Go to Apple Menu >> System Preferences >> Accounts and choose your account. Then select Login Options and change Automatically login: to Disabled. Now when you start up you are presented with a login screen you to enter your details, which is much more secure.
source – Mac Format: 200 Mac Tips

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