What are the differences between SD, SDHC, and SDXC memory cards, and how do they impact the storage capacity and compatibility of devices?

SD, SDHC, and SDXC memory cards differ in their storage capacities and compatibility with devices. SD cards have a maximum capacity of 2GB, SDHC cards can hold up to 32GB, and SDXC cards can store up to 2TB. The main impact of these differences is that devices must be compatible with the specific type of memory card in order to use it effectively. Devices that only support SD cards may not be able to read SDHC or SDXC cards, limiting their storage capacity.