From The Atlantic:
Scholars aren’t quite sure about the origins of applause. What they do know is that clapping is very old, and very common, and very tenacious — “a remarkably stable facet of human culture.” Babies do it, seemingly instinctually. The Bible makes many mentions of applause – as acclamation, and as celebration. (“And they proclaimed him king and anointed him, and they clapped their hands and said, ‘Long live the king!'”)
But clapping was formalized — in Western culture, at least — in the theater. “Plaudits” (the word comes from the Latin “to strike,” and also “to explode”) were the common way of ending a play. At the close of the performance, the chief actor would yell, “Valete et plaudite!” (“Goodbye and applause!”) — thus signaling to the audience, in the subtle manner preferred by centuries of thespians, that it was time to give praise. And thus turning himself into, ostensibly, one of the world’s first human applause signs.
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