Digital technology is the culmination of all computer technologies and differs from analog in having fewer moving parts as it is computer controlled. Image Capture is an Apple program that allows users to upload pictures from digital cameras or scanners connected directly or via network, providing no organizational tools but useful for collating pictures from various sources without drivers. A file extension is the ending of a file in operating systems like Windows that helps identify the type, often a period followed by 3 characters but sometimes 1, 2, or 4 characters long, for example "myfile.txt" has the ".txt" extension associated with text files.