Foraging is a Survival Challenge activity. Its more opportunistic than active Hunting, and relies primarily on smaller game and insects easily trapped, and what vegetables, fruits, tubers or similar plants to survive.
Subsistence is mainly done with primitive tools and means, and/or in order to do little impact on the habitat (leaving little trace). It is taking only what is needed in the moment – bare maintenance of health for necessity. The capital application accumulates sustenance on a larger scale for future use. This typically leads to farming and animal husbandry and employs more powerful technology and processes as it scales up.