Primary groups are small and tightly knit,bound by a very strong sense of belonging.They're mutually supportive places where members can turn for emotional,social and financial help,ex.family. Secondary groups are large and impersonal groups,whose members are bound primarily by a shared goal or activity,rather than by strong emotional ties,ex.a company.Secondary groups can become primary groups over time,as a set of coworkers spends time together and becomes a primary group of friends.