The document discusses different types of social organizations. A social group is defined as a number of people who identify with and regularly interact with one another, exhibiting cohesiveness. They share interests, values, backgrounds, roles, or kinship. Examples include families, friends, clubs, religious groups. A social category is a collection of people who do not interact but share characteristics like gender or age. A social aggregate is merely a number of individuals who do not interact or share traits but happen to be in the same place, like passengers on a train.