Global group is also called universal group users.
Explanation:
A network administrator has two domains are such as PLABA AND PLABB. End-user of each domain wants to login both domain PLABA AND PLABB.
Network administrator has created global group accounts user domain and map all the users in the global group user domain. For every user active directory and rights also be mapped. Global group is also called universal group users. Group polices of each user has to be applied and mapped properly.
Once user are mapped and activated user can login from both domain server.