Altruism is behaviour which is typical for, or at least frequently manifested by, individuals within a species, which is advantageous for populations within the species to which the individual belongs, but detrimental to the individual's prospects of reproduction. It is exhibited in a wide range of creatures, including man, many primates, wolves, bats and even cellular slime moulds.
Within mainstream science, altruism is difficult to explain. Evolution selects individuals who survive and reproduce, not populations. In a population with just some altruistic individuals, the non-altruistic individuals will be more likely to reproduce than the altruistic ones, which surely must in time result in there being no altruistic individuals left. Explanations as to why altruism nevertheless exists involve complex gaps.
The QO explanation - QO altruism - is based on the concept that a species exists as a quantum concept, capable of shaping its manifestations. This explanation follows naturally on from QO and has a relative Occam score of 0000. It is therefore to be preferred.