What is the evil eye?

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To understand the origins of the evil eye, one must first understand the  distinction between the amulet and the evil eye itself. Though often  dubbed as ‘the evil eye’, the ocular amulet is actually the charm meant  to ward off the true evil eye: a curse transmitted through a  malicious glare, usually one inspired by envy. Though the amulet – often  referred to as a nazar – has existed in various permutations  for thousands of years, the curse which it repels is far older and more  difficult to trace. 

(Source: https://www.bbc.com/culture/article/20180216-the-strange-power-of-the-evil-eye)