reference groups are those that provide to the individual some points of comparison more or less direct about his behavior, lifestyle, desires or consumer habits. They influence the image that the individual has of himself
as well as his behavior. Whether it is a membership group or a non-membership group. Because the individual can also be influenced by a group to which he doesn't belong yet but wishes to be part of. This is called an aspirational group. This group will have a direct influence on the consumer who, wishing to belong to this group and look like its members, will try to buy the same products.