What is a channel?

In Slack, teamwork and communication happen in channels. When you organize conversations in channels, it helps bring the right people together to share ideas, make decisions, and move work forward. Read on to learn all about how to create, join, and work in channels.

All about channels

Create channels

Channels can be organized around anything, and unlike siloed email threads or virtual meetings, make it easy to collaborate across locations and time zones. A workspace can have as many channels as needed, and they're available for all plans.

 Public channels

  • They're open for all members of a workspace to join, and anything posted is searchable by others. Everyone gets a collective, shared view of a project’s information, team, and conversations. 
  • By default, all members (but not guests) can create public channels. Workspace Owners can limit channel creation to certain roles if they'd like.

 Private channels

  Multi-workspace channels

  • Multi-workspace channels connect separate workspaces within an Enterprise Grid organization.
  • Multi-workspace channels can be public or private.
  • Org Owners and Admins can create multi-workspace channels within their organization, and give members permission to do this if they'd like.

Tip: By default, all members (but not guests) can send and accept invitations to work with people from other companies in a channel using Slack Connect.

Join channels

How members join a channel depends on the type of channel it is.

 Public channels

 Private channels

  Multi-workspace channels

  • Whether the channel is public or private determines how members can join.

Use channels

While a workspace can have as many channels as needed, Slack works best when channel guidelines are in place, and certain best practices are followed.


Best practices

  • Transparency matters, so most conversations should happen in public channels so that they’re searchable by all members. Don’t worry — members can set channel-specific notifications and choose when to get notified or mute activity altogether.
  • Maintenance is important: archive unused channels when they’re no longer needed, or delete them entirely if you don’t want to preserve their history.
  • Manage who can post with spaces dedicated to announcements, reviewing support tickets, or showcasing your team's work. 
  • If the nature of a channel changes, it can be converted from public to private, but not vice versa. For privacy reasons, private channels cannot be made public.