Father Christmas, in Christian and secular Western tradition, is also known as Santa Claus or Saint Nicholas. He is usually depicted as a large fat man in a red coat and hat trimmed with white fur, with a bushy white beard and a distinctive laugh usually rendered in text as "ho ho ho." His job is to bring presents to children on the night of Christmas Eve.
In the Doctor Who continuum, it is a puzzle as to whether Father Christmas exists. One episode seemingly dealt with him, only to reveal that it was all a shared dream. However, a tangerine does appear inexplicably, hinting that there is a Father Christmas, but that the one the Doctor and Clara encountered was not the genuine article.