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Digital still cameras are cameras whose primary purpose is to capture photography in a digital format. Initially, a digital camera was characterized by the use of flash memory and USB or FireWire for storage and transfer of still photographs, and this is still the common meaning of the unadorned term. Many modern digital photography cameras have a video function, and a growing number of camcorders have a still photography function. However, even a low-end still camera can take far better still pictures than a mid-range video camera, and mid-range still cameras have much lower video quality than low-end video cameras. In addition, some newer camcorders record video directly to flash memory and transfer over USB and FireWire. Among digital still cameras, most have a rear LCD for reviewing photographs. They are rated in megapixels; that is, the product of their maximum resolution dimensions in millions. The actual transfers to a host computer are commonly carried out using the USB mass storage device class (so that the camera appears as a drive) or using the Picture Transfer Protocol and its derivatives, in addition firewire is becoming more popular and supported among more digital cameras.
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