Group accounts can be used to simplify administration by organizing collections of users, computers, and other groups. There are two main types of groups - security groups, which can be assigned permissions, and distribution groups, which are primarily used for email. Groups can be global, domain local, or universal in scope. Global groups organize objects within a domain, domain local groups can contain objects and be assigned permissions within a domain, and universal groups can aggregate objects across domains. Group and computer accounts can be created and managed through Active Directory Users and Computers or command line utilities, and various built-in groups are automatically created during Active Directory installation.