What is a tritone and why was it nicknamed the devil's interval

There’s an interval so dissonant that it’s earned the nickname ‘The Devil’s Interval’ and was avoided for centuries by composers and the pupils they taught.

Tritone - Devil in Music. How to use it?

BBC NEWS, UK, Magazine

Why did Bernstein build West Side Story around 'The Devil's Interval'? - Classic FM

Why did Bernstein build West Side Story around 'The Devil's Interval'? - Classic FM

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The Tritone, Everything You Need to Know

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Why is The Tritone banned in Catholic Churches? - Quora

Hvilken type matte er mest anvendelig i hverdagen? - Quora