Combat is an errand which makes Duplicants fight critters. To create a Combat errand, either select a critter and click on the "Attack" button, or select the attack tool (press T) and drag a rectangle over the critter(s) you want to be attacked. A Duplicant's Excavation skill affects this job's speed.
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Attacking critters is usually only useful for harvesting meat (most critters will drop fresh meat upon death), getting them out of the way, or pruning their populations, as all critters (with the exception of Pokeshells, who will defend their eggs) are non-hostile (unless attacked) and can be domesticated to produce resources: Hatches excrete Coal, Pufts concentrate gasses into solids, Morbs produce Polluted Oxygen, Slicksters exude Oil, etc.