Groups
Google Groups makes it easy for groups of people—such as project teams, departments, or classmates—to communicate and collaborate.
Here are the things you can do with Google Groups:
You can send an email to everyone in a group with one address,
Invite a group to an event
Share documents with a group.
Create an online forum to discuss a topic or answer questions about a product.
To get started go to groups.google.com. Here is a detailed video tutorial for Google Groups:
For Google Apps for Work users you can create groups within the Admin Panel. For detailed instructions Click Here.