Messages allow you to chat one-on-one (Direct Message) or as a group (Space). You can share content into a Message, or share your answers to assessments or question prompts. Within the Message, participants can reply to comments.
Spaces allow large groups (an unlimited number) to message each other around a topic or experience. You can include a Space in an Invitation, and members can come and go.
Direct Messages allow up to ten participants to communicate with each other. The Direct Message is titled by participants' names rather than by a topic.