SD Card

SD is an abbreviation of Secure Digital. It is a type of computer memory. It is a non-volatile memory. It is an output storage media of electronic device. It is used to save the necessary data in the computer such as: documents, pictures, software in large size, etc. to view, correct, copy paste, print delete, etc. 

-    It is especially used in cameras, mobiles or video cameras.

-    It was released in 1999.

For example, look at the SD Card / Memory in the below picture:

Fig: SD (Secure Digital) Card