Personal Identifiable Information
Also referred to as "PII", personal identifiable information is very important when considering how secure your data should be. PII is defined as any data that could potentially be used distinguish or trace an individuals indentity. If your job function requires you to handle this sort of information on a daily basis you should take extra steps to secure your computer.
For information on how to properly handle PII, review the GSA Rules of Behavior for Handling Personally Identifiable Information (PII)