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The RAMPS 1.5 is a variation of the popular RAMPS boards that, like all other RAMPS boards, is plugged into an Arduino Mega for operation. The layout of the RAMPS 1.5 is virtually identical to that of the RAMPS 1.4. The only real difference between the two are the MOSFETs and the fuses.
Both use the same mosfet but simply have them installed differently: the RAMPS 1.4 has them oriented sideways with a heatsink in away that allows it to be easily plugged and unplugged; the RAMPS 1.5 has the mosfets soldered flush to the surface with flush heatsinks on the bottom of the board.
The RAMPS 1.5 uses small soldered fuses rather than the large yellow fuses prone to breakage on the RAMPS 1.4.