Nests are special locations for social insects to store food and rear brood. A nest is a unique location unlike all other locations. The survival of social insects depends on the ability of foragers to navigate back to a nest after a trip to collect resources.
For insects that do not make nests, no one location is of unique importance to survival. Numerous locations may contain equally suitable resources and the need to navigate back to the same resource is not as critical….
Source: Living With Insects Blog