Eirikr70 Work profiles are profiles created by an MDM or Mobile Device Management app. They're usually used by your employer to manage a "sub-profile" where you can contain your work-related apps.
Some users use work profiles to isolate apps from others in their main profile while still being able to access them without switching users. They provide less isolation than regular user profiles, but have some usability benefits over user profiles as well (namely not needing to switch profiles).