It lets you nominate specific times in your schedule that other people (such as students or colleagues) can book.
The appointment slots feature in Google Calendar can deliver both of these things. Wouldn’t it be great if you could get students to schedule a time with your first? Better yet, one that you had predetermined to be OK? Whether it be students queuing in the hallway to ask a question before an assessment, or rushing in while you’re mid-way through your lunch to get work signed-off, the timing can often be inconvenient to all involved.
If you often have students visiting your office outside of class time, you’ve probably noticed things can get a bit hectic.