This is separated into sections:
DMs can be from you to another person
If you include other people in to the message / reply, it will form a group
Good for quick messages between each other
Used to communicate with a group of people or a department (Example: SLT, Behaviour Team, Truanting students)
Focus your conversation on a common area of interest or your projects, or make organisational announcements.
Share files to other members that can be accessed from within the space