Most countries have their own type of Christmas cake. In Italy it is a beautiful bread based Pannetone, which is a sweet bread with dried fruits added. In Germany, it would be an almond flavoured Stollen. Some people have a Yule log, a chocolate cake log shaped and this links back to the ancient, pre Christian British festival of burning a Yule log at midwinter.
Here in Britain we have a traditional fruit cake. The Royal family eat a traditional iced Christmas cake on Christmas day- even the royal children who eat in the nursery away from the adult family. In Scotland the cake is covered on top with almonds and called Dundee cake after that lovely city.
I have made a traditional English cake. They are usually decorated but not always. Some people use a boiled fruit cake recipe to make it moist.
Although I make this for everyone, I of course couldn't eat it as I gain weight easily. But one slice won't do you much harm! :)