From the Contacts page you can select a group or multiple contact individually and perform specific actions. These actions include messaging the selected contacts, adding or removing a tag, exporting or deleting the contact records or update a contact field. These options are available from the Actions menu:
Compose Message: Send a message to just the contacts selected
Add/Remove a Tag: Add or remove tags by groups of contacts
Update: Mass edit contact fields, you could change the departure date for a group hotel guests for example
Export: Export contacts to a CSV, delivered to your email
Merge: If the same contact has messaged in via two or more separate channels, you can merge the contacts to consolidate
Delete: Remove selected contacts from your service entirely, this deletes all conversation history with the contact as well