Private teams can only be joined if the team owner adds someone to them. 

Public teams are visible to everyone from the teams gallery and you can join them without getting approval from the team owner.

Change a team's privacy status

To change the privacy settings for your team from public to private (or vice versa), go to the team name and select More options More options button > Edit team toward the bottom of the menu. Under Privacy, select either Public or Private.

To change a team's privacy settings, go to the desktop or web app.

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