Harry Potter attained his lightning bolt scar when he was 1 year old. When Voldemort came to kill Harry (because of the prophecy "neither can live while the other survives"), Harry's mother, Lily Potter (formerly Lily Evans) refused to stand aside and gave her life to save her son. Because of her sacrifice, Voldemort's curse backfired, leaving Harry with only his famous lightning shaped scar.
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It is a scar in the shape of a lightning bolt. The scar was caused when Lord Voldemort tried to kill him, when the curse failed it left that scar. The scar and the failed curse connect Harry to the Dark Lord.
Harry Judd got the scar on the side of his head by walking into a window when he was young.
Yes.
It identifies him as the boy who lived.
Harry Potter has scar on his head because when he was a baby Lord Voldemort attempted to kill him with a killing curse. However, when his mother died to protect him it backfired on Voldemort and Harry got a scar instead.