That's not really a distinction. Kin selection is a phenomena by which genes can propagate despite them not benefiting (or even harming) the individual that pos

That's not really a distinction. Kin selection is a phenomena by which genes can propagate despite them not benefiting (or even harming) the individual that possesses them if it increases the probability of reproduction for other individuals possessing the gene (eg. if they are likely to be related). It's evolutionarily plausible and explains a massive range of traits and behaviors up through full altruism. See eg. "gay uncle" hypothesis: https://en.wikipedia.org/wiki/Biology_and_sexual_orientation#Gay_uncle_hypothesis https://en.wikipedia.org/wiki/Biology_and_sexual_orientation... I would describe kin selection as a phenomena that is caused by natural selection because natural selection is a phenomena describing propagation of genes and not propagation of individuals. This is a subtle point and often not taught unless taking specific relevant coursework (I learned about it in an animal behavior class). I am likely using slightly incorrect phrasing and evolutionary science experts may phrase things differently, though I am confident in the essence of this argument.