If you leave your computer logged in then any accounts, or information you have access to, are at risk. As embarrassing as it may be to come back and find yourself with a goat on your desktop we also have to remember that we all have access to sensitive information and systems.
Your computer should be protected with a password and set to lock when left unattended. Your screensaver can be set on a timer but it's much better if it becomes second nature to enable the screensaver as you leave your desk.
- On a Windows computer you can simply press the Windows key + L
- On a mac you can set the screen saver to come on instantly with hot corners or press the Apple icon (top left) and select sleep.