Financial institutions play an important role in national economies and come in various types. They include central banks that oversee other financial institutions, commercial banks that serve individuals and businesses, and non-banking financial institutions that provide alternative services like investment and brokerage. Other types are credit unions owned by members, investment entities that help organizations raise capital, thrift institutions focused on lending to owners, and insurance companies that protect against financial risks. Overall, financial institutions regulate money supply, provide banking and investment services, offer advice, and help keep economies active.