The confirmation memo is a one-page summary of a show's advance, generated as a PDF or CSV. It pulls the confirmed details, so the venue, the artist, and the crew are all working from the same document instead of piecing it together from email threads.
For a team managing multiple shows, a clean confirmation record cuts down on back-and-forth before the day of show and gives you something concrete to point to at settlement. Print it, email it, or drop it into whatever system you use for records.