The Member Directory is a friendly, year-book-like grid of all the people in your Cohort: learners, teachers, etc.
You'll find the Member Directory under the Community tab of your course. You can make it visible to only staff members on your account or visible to everyone, including your learners.
Each member has a "Member Profile Card" that includes:
A profile picture or initials
First name & last initial (full names aren't shown to anyone but staff members)
Location if they chose to enter it
A short "about me" section if they chose to enter it.