Workers

Workers are laborers that you assign to various places, such as your capital, mines, or research labs. Typically they are either humans from your crew, which you get by successfully inviting friends, or droids which you build at the droid factory.

Humans are usually preferable to droids, as they are free (all it takes is an invite) and more productive. However if you don't have any friends who will accept your invites, droids at least enable you to increase your production.

Droids and Humans can work in the following places.

Research Lab

Human: Scientist Droid: Lab Droids

Capitol

Human: Laborer Droid: Build Droid

Mines

Human: Miner Droid: Mining Droid

Fleets

Human: Captain Droid: Crew Droid