look at this page:
http://www.how-to-repair.com/help/how-to-unblock-a-fridge-leaking-water-from-inside/
The right hand picture shows a generic fridge/freezer compressor (black can thing) with a drip tray on top (white/translucent plastic moulding.)
There should be a pipe leading from the drain hole inside the fridge, transferring condensate to the tray on top of the compressor, where the water will evaporate from the warmth of the compressor.
Take heed of the other answers, though, September 2016