SendBird is a messenger for communication and supports below features.
1. Open chat: Open chat is a public chat. There is a channel which can be participated by anyone without an admission.
2. 1-on-1 messaging: 1-on-1 messaging is a private channel between two users. Basically it is same as group messaging channel with only two members.
3. Group messaging: Group messaging is a private channel between multiple users. The user who wants to join the Group messaging channel has to be invited by other user who is already joined the Group messaging channel.
* Abusing users are reported by other users will be deactivated by SendBird Messenger Administrator.