The only time I really run into the term SD card is when I’m trying to locate phone files on my computer, and one of the file names is “SD.” This leads me to believe that an SD card has something to do with phone file storage. In the early 2000s, there were multiple memory cards fighting to become industry standard, but obviously ultimately the SD card won. Why, you ask? It was small, but still allowed for great room for storage space, and it was adaptable across multiple devices (as compared to Memory Stick, which was almost exclusively for Sony devices). Because it was so adaptable, it was cheaper for companies to use SD cards. SD stands for “Secure Digital.” Due to decreases in the size of flash transistors (AKA flash memory), and an increase in how many flash transistors can be crammed onto one card, we’re looking at SD card sizes today that were unthinkable ten years ago. On the bottom of an SD card, you will notice a circle with a number inside of it. This number means how fast the SD card can perform an action in megabytes per second. Looking at the pace of evolution for SD cards over the past ten years, I can only imagine what the future holds for data storage.