A candid photograph is a photograph captured through motion
mostly, without creating a posed appearance. This is achieved by avoiding prior
preparation of the subject and by either surprising the subject or by not
distracting the subject during the process of taking photos. Thus, the candid
character of a photo is regardless of the subject's knowledge or consent as to
the fact that photos are being taken, and regardless of the subject's permission
for subsequent usage such as distribution, but related to the apparent absence
of posing. It is distinguished from making secret photography by the photographer usually remaining
discernible to the public and not wearing cover.
-Ref: Wikipedia.
