Social insects are those insects that live in a society or group, where each individual has a specific role to play in the group. Some of the most common social insects include wasps, termites, and bees.
However, the cotton stainer is not a social insect. It is a type of insect that feeds on cotton plants, and it does not live in a group or society like the other three insects mentioned. Instead, cotton stainers are solitary insects that prefer to live and hunt alone.
So, in summary, wasps, termites, and bees are social insects, while cotton stainers are not.