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Slack organizes conversations into dedicated spaces called channels. Channels bring order and clarity to work — you can create them for any project, topic, or team. With the right people and information in one place, teams can share ideas, make decisions, and move work forward.
Tip: Slack lets you collaborate in channels with people both inside and outside your company. Learn more about using Slack Connect to work with external people.
Public vs. private channels
In Slack, channels can be public or private.
Public channels promote transparency and inclusivity. Any member of your workspace (but not guests) can view and join a public channel, giving everyone access to the same shared information. Messages or files posted in a public channel can be searched by other members of your workspace.
Private channels are for conversations that should not be open to all members. People must be added to a private channel by someone who's already a member of the channel. Messages or files posted in a private channel can only be searched by members of that channel.
Every Slack workspace has a #general channel, which is the only channel that members (but not guests) are automatically added to and unable to leave. This channel works best when it’s used for sharing workspace-wide announcements. The #general channel can’t be archived, deleted, or converted to a private channel.
Channel tips and best practices
Use public channels as much as possible to increase access to shared knowledge across your workspace.