What Is An SD Card?
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"A Security Digital, or SD card, is a tiny storage card that uses flash memory to store large amounts of data. They are the ideal location for storing all forms of data. Cellphones, cameras, audio/video players, camcorders, handheld computers, and other electronic devices can all store media on them. (file ///sdcard)
So, what are the many varieties of SD cards? Since 1999, SD cards have changed significantly in terms of shape, size, and memory storage. What started off as 32 MB of storage has now expanded to 128 TB. At initially, only SD cards were available, which were the largest and had a cut-corner design.
All of these SD and micro SD cards have made data storage a breeze because they allow you to backup and recover all of your data from one device to another. Data can be transferred from any type of SD or micro SD card to a computer or external device using a card reader."