In a
turn based strategy or
real-time strategy, a location or item that produces a
resource. In some games (
Starcraft,
Warcraft), generators contain a fixed amount of
resources. In others (
Total Annihilation,
Disciples), generators produce a steady stream of
resources - uncollected resources are lost.
Note that depleted Vespene geysers in Starcraft actually have an infinite amount of vespene; once depleted, resource gatherers can only collect a smaller amount per harvesting trip.