It basically translates to “double goer,” a name given to the specter of a human being seen while the one it resembles still lives.
To be somebody's doppelganger you must be extremely similar in many ways that others are very unique.
There are several theories behind why we may have doppelgangers.
On the topic of doppelgangers there are many theories that depict why we have look alikes.
One being that your doppelganger is just your future self, or your double is your unrelated evil twin, and some theories suggest that having a doppelganger means you’ve contracted superpowers.
Though all the superstition scientists cannot confirm any of these theories and do not back them.
Science behind why we don’t have doppelgangers
“For somebody with an average face its comparatively easy to find good matches” said Nick Fieller a statistician involved in The Computer-Aided Facial Recognition Project, to BBC.
Exact look alikes might be our genes running out of options, humans are not genetically diverse so soon someone will have the same