SDXC cards are SD cards but with a much higher capacity and faster processing speeds. They have a maximum capacity of 2TB (Terabytes).
An SDXC memory card is actually the best supported memory card type amongst all video cameras that were launched in the last 12 months.
A MicroSDXC memory card is the worst supported memory card type amongst comparable types of video camera.
SDHC cards are DS cards with a higher capacity of up to 32GB.