Would you mind to explain about evil eye? Is it related to harm that comes to a person because of someone else's jealousy or envy towards them?

I heard about this a lot. In my country they call it " 'ain illness " they believe for example we post our photos/videos in social media then because of someone's jealousy our face could turn into "ugly" by acnes or something like that, is such thing real?

You may see this video: