What are USB flash drives or USB memory sticks?
Strictly speaking, USB flash drives are not ‘memory cards’ as such but they do perform a similar function. They are not used by digital cameras but rather are a form of portable storage, which, given their USB interface, are extremely easy to use with a PC. Also, most digital photo frame models allow you to directly plug in your USB flash drive to play a slideshow of all the photos and files stored on it.