When you collect an email or SMS number from a client during the photo capture process, it's used to deliver the photo to the guests. We call this the Email (or SMS) NOTIFICATION. Photo links are usually delivered within seconds, and larger videos can take 1 to 5 minutes to process and deliver, depending on the size of the video and the internet speed available.
However, sometimes it serves your purpose to permanently or temporarily HOLD the notifications. It may be a client request to hold notifications, or delayed delivery tied into a contest, or you may want to approve the images, etc. Whatever the reason, putting notifications on hold is a click away.