What is the full form of 'SD' in SD Cards?

Secure Digital

System Digital

Set Device

Startup Device

Secure Digital (SD) is a non-volatile memory card format .
SD is a type of memory card used to store data in portable electronic devices. The first SD cards were introduced in 1999.
They used almost the same form factor as the existing MultiMediaCard (MMC) format, but were slightly thicker (2.1 mm vs 1.4 mm).

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