What are the group types on Workplace?

After you create a group you have the option to choose a group type. Group types help organize your groups.

To choose a group type:

Group types include:

Teams & Projects: Share and discuss updates with your team or project. This group type has an automatically synced chat attached to it, and is closed by default. T&P groups have a group member limit of 250 people. There are no group moderators in this group type, only group admins. Automated group membership isn't allowed.
Open Discussions: Give feedback on projects, products or other initiatives.
Announcements: Share company events, updates to policies or other company wide announcements. Announcement groups have notifications switched on for all users, regardless of member count.
Social & More: Get to know your coworkers in groups for sports, hobbies or other social activities.
Learning & Development: Set up a learning space for your company.
Multi-Company Groups: Allow people from multiple organizations to collaborate. MCGs can be secret or closed. You can invite people from other companies to multi-company groups. You'll see the option to create a multi-company group when creating a new group.

Note: Adding a synced chat to your group will limit maximum group membership to 250.