Why would I use a group display name and description in Contact Manager?
Contact Manager lets you identify the opt-in groups you create with group names and descriptions. These fields help you send email newsletters to different groups of subscribers without confusing them.
Opt-in groups let you target a diverse audience with your newsletters. You can create groups for subscribers sorted by specific events or products they want to learn more about. For example, you can define a group of contacts interested in testing new products before they are released to the public, and a group of contacts who want to be notified when new products are for sale.
For more information on Contact Manager groups, see Can I identify my newsletter subscribers by interests or types?