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 comparable spec camcorders that were launched in the last year.
The worst supported memory card type across comparable types of camcorder is MicroSDXC.
SDHC cards are DS cards with a higher capacity of up to 32GB.