When you share work to an ATLAS workspace you are typically making your work available to be viewed for feedback or assessment.  Exactly who will have access to your work depends upon the permissions set by the manager of the workspace.  If the activity and the assessment process requires it, the manager might allow one or more lecturers, tutors, and/or external examiners to view and/or assess your work.  If the activity is a peer review one, the manager might allow other students to view your work so that they can provide feedback.  Your lecturer or tutor should explain to you, as part of the teaching activity, who will be viewing your work in ATLAS and what they will be doing with it.