What is an SD Card?
It's that little magic thing that you put into your camera, which takes stuff like pictures and videos. You can even use it to store files like word documents and MP3s!
How many kinds of SD Cards are there?
When it first started, it was just "SD" - Secure Digital - about a little thin card that's about 1" by 0.75" around.
Then it got a little smaller (mini SD, rarely used nowadays). Finally, we're up to MicroSD, which is super tiny, roughly the size of your pinky nail.
What is SD / SDHC / SDXC?
The first SD Cards produced generally run up to 2gb (or ~2000mb) in size.
Then SDHC (Secure Digital High Capacity) came around and increased the size limitation to 32gb.
Finally, we're at SDXC (Secure Digital eXtended Capacity), which has a theoretical limitation of 2TB (around ~2000gb or ~2,000,000mb!) So far, the biggest SDXC Card on the market is around 128gb..
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