What is the compatibility between SDHC and SDXC cards?

SDHC and SDXC cards are both types of SD (Secure Digital) memory cards, but they have different storage capacities. SDHC cards have a maximum capacity of 32GB, while SDXC cards can go up to 2TB. Most devices that support SDXC cards can also use SDHC cards, but not all devices that support SDHC cards can use SDXC cards due to differences in technology and compatibility.