|Using community / Using external groups|
A company may invite you to join one of their groups and become part of their online community so they can work closely with you, making you an external contributor. Becoming an external contributor is a way to collaborate in a community on a limited basis. As an external user, you can view content and participate only in the group you belong to.
Once you accept an invitation to join a community's external group, you can begin contributing to that group. For more information, see How to begin contributing to community.