Worker

To survive, a civilization needs skilled workers. They may be highly trained engineers, or civilians conscripted into labor - or, indeed, slaves - but someone has to dig the mines, plant the fields and pave the roads. Without these men and women, a civilization will stagnate and eventually fall prey to a more vigorous neighbor.

They're vital for a civilization - absolutely the most important civilian unit in Civilization-like games. It builds all land improvements like farms and mines that give access to resources and improve tile productivity. It also constructs roads and railroads to connect the cities, both in an empire and city-states. Finally, it can repair damaged improvements.