Secure Digital High Capacity (SDHC) is a type of flash memory card used in digital cameras and mobile phones to store data about images and apps.

SDHC is an improvement on the popular Secure Digital(SD) memory card technology. SD cards are limited to 2GB (gigabytes) in capacity, while SDHC can store between 4GB and 32GB.

Because of the change in the technology, some older digital cameras that use SD cards cannot read the SDHC cards. SDHC cards include an "HC" in the Secure Digital logo. You may be able to upgrade your camera's firmware to make it compatible with SDHC, so check with your camera manufacturer's web site.

The SDHC card standard appeared in 2006, and SDHC cards are similar in size to SD cards, which are slightly rectangular with one corner cut at a 45-degree angle. SDHC cards measure 24 mm by 32 mm by 2.1 mm (0.94 x 1.26 x 0.08 inches).

Another format, called Secure Digital Extended Capacity (SDXC), was introduced in 2009, and it calls for cards with storage capacities up to 2TB (terabytes), or 2,000GB.

These come in the following sizes the standard is the SD Card, Micro SDHC need a an adapter to to turn it into a standard SD card or MiniSD card. Please see above image.