Is the JDK required for Kotlin?

I have not used Android for a long time but now I find a new term, Kotlin, so my doubt is, JDK is required for Kotlin?

If Kotlin will replace to Java, so the JDK it is not necessary because according to me JDK is for develop on Java, is correct?

If it is correct then I have other doubt (this already it’s old) why JDK is used for Android if this already include an Android SDK?

P. D.
I am going crazy, I need a single explanation.

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