1) The top surface of a desk 2) A desktop computer — Merriam-Webster Dictionary

#1 In fact, all software works according to a symbolic system based on the recurrent use of metaphors: there is the desktop, the folders, the trash can, the mailbox and so on. This obviously happens because of the human tendency to apply already known concepts to new experiences; a fundamental need that favours the understanding of novelties and the crossing towards the future. — Valentina Tanni, DESKTOP IS: the first on-line desk top exhibition, 2000