You might want to use a channel if you want to collaborate with a group of people who are all members of different teams. For example, people from engineering, sales, and support who all work on different aspects of the same project or product could use a shared channel to collaborate. The answer to this is Shared Channel.
Shared channel is currently in public preview and you need to enable public preview settings in your tenant.
Below is the reference link to enable public review in teams.
Once Teams update policy is created and assigned to user in teams, user should manage his/her client settings by following below steps,
1. Select the three dots to the left of your profile to display the Teams menu.
2. Select About > Public preview.
3. Select Switch to Public preview.
Policy control for shared channels.
You can manage Teams channel policy through Teams admin center to create shared channels
Cross tenant access
For cross tenant access, these channels depend on another mechanism called azure B2B direct connect. You don’t need to add users to your tenant as guest, but your tenant will automatically authenticate external users. A single channel can be used to collaborate multiple channels.
Currently, Shared channel only allowed for users with an Azure AD account.
To allow people from other Microsoft 365 tenants to share a channel, you must configure Azure AD cross-tenant access to permit collaboration with other tenants. Likewise, tenants that host remote users must allow those users to collaborate with your tenant
Creating a Shared channel in Teams.
One can create a shared channel in teams by right clicking your team and selecting shared channel.
Shared Channel Sharepoint sites.
Like private channels in Teams, shared channels also has its own sharepoint site. The separate site is to ensure access to shared channel files is restricted to only members of the shared channel.
Membership to the site owner and member groups are kept in sync with the membership of the shared channel. Site permissions for a shared channel site can't be managed independently through SharePoint.
Teams manages the lifecycle of the shared channel site. If the site is deleted outside of Teams, it is restored automatically within four hours as long as the shared channel is still active. If the site is permanently deleted, a new site is provisioned for the shared channel.
Why Shared channel?
Shared channel can help you collaborate with people inside and outside your team or organization. People outside your org can participate in a shared channel without switching orgs.
One should use shared channel if you want to collaborate with,
1) Specific people on your team (Which is also a feature of private teams)
2) People outside your Team.
3) People outside your Organization without switching orgs.
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