Here's the deal - You are getting married and probably moving into a new place. You are going to need a lot of stuff. New china, an oven, linens, lights and a coffee table are just a few of the things that you and your partner will need to start off your new life together.
A gift list, traditionally known as the gift registry in the US (list sounds more fun) is a list of items compiled by a person or a couple or a group of friends and family and then shared with anyone who intends to give a gift on the special occasion. It saves the guests from having to worry about and wasting time and money by gifting something that is either not required or a duplication.
A gift list is for any event that warrants a gift, like your friend's birthday, your mom's birthday, a housewarming, graduation, a college reunion, a family reunion, the coming of a newborn. The news of the coming of a newborn Any gift needs a thought behind it.
A list is there to make this easier. It also saves the receiver from being in the uncomfortable position of having to exchange or return an unwanted gift.