In terms of natural selection theory, kin selection can be best described as:

Kin selection is best described as a subset of natural selection theory. This concept arises from the idea that individuals can enhance their genetic success not just through direct reproduction, but also by helping relatives who share a significant proportion of their genes. This means that behaviors or traits that may seem self-sacrificial in terms of direct reproduction can actually be advantageous when they increase the likelihood of survival and reproduction of closely related individuals.

As a subset of natural selection, kin selection focuses specifically on the genetic benefits gained by aiding relatives, highlighting the importance of genetic relatedness in evolutionary processes. This principle illustrates how natural selection can operate at different levels, influencing social behaviors that promote the reproductive success of kin, thus shaping the evolution of certain traits within populations. The broader framework of natural selection encompasses other factors, making kin selection a focused aspect that contributes to our understanding of social behaviors in animals.