The Wikipedia Definition of a Selfie:
A selfie (/ˈselfiː/) is a self-portrait photograph, typically taken with a digital camera. Or more recently by camera phone held in the hand or supported by a selfie stick. Selfies are often shared on social networking services such as Facebook, Instagram and Twitter. Also, they are usually flattering and made to appear casual. Most selfies are taken with a camera held at arm’s length or pointed at a mirror. Rather than by using a self-timer. A selfie stick can be used to position the camera farther away from the subject, therefore allowing the camera to see more around them.