Subject lines in the emails serve the same role that headlines do in newspapers and magazines.
Subject lines are the short and single line sentence or phrase seen as the title of an email when received. They do the same purpose as that of the headlines of a newspaper. Newspaper headlines provide a brief idea of the news below it. It is also made attractive. The same goes with the subject line of an email. It needs to be catchy as well as compact. It gives the overall idea of the content of the email to the receiver.
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