....field while a row represents a record
Answer:
i think digital signals
Explanation:
A digital signal is a signal that is being used to represent data as a sequence of discrete values; at any given time it can only take on one of a finite number of values.[1][2][3] This contrasts with an analog signal, which represents continuous values; at any given time it represents a real number within a continuous range of values.
1. uses binary code to store data!
1. George Eastman's film, which was used for early motion pictures,
2. Polaroids instant film, which after being removed from the camera would dry and reveal a picture.
I hope this helps, I had to research these :)