With the introduction of more compact technology Sd cards became the most popular medium of storing data on compact devices. They can be found everywhere taking from mobile phones, tablets, Mp3 players, digital cameras, camcorders, voice recorders and much more. Although their function is same, their specifications are quite different from each other.
Knowing the details:
For a start, SD cards come in three physical sizes. These comprise standard-size SD cards (first developed in 1999), smaller mini SD cards (introduced on some mobile phones in 2003), and the even smaller micro SD cards. The latter was invented in 2005 and are becoming increasingly popular on smartphones and tablets. While the larger cannot fit in smaller card slots, so adapters are available to enable micro and mini SD cards to be accessed by any device that accepts a standard size card.