Something that bears an analogy to something else: Surimi is marketed as an analogue of crabmeat.
Analog is often refered to as the representation of reality, or the real.
Computers. Involving or using numerical digits expressed in a scale of notation to represent discretely all variables occurring in a problem. Something manipulated with a finger or the fingertips.
Digital is nothing more than the mathematical manipulation or representation of the analog reality.
Kudos to dictionary.com for helping to provide the definitions.