Confused between JDK and SDK

Hello, everyone,
I am really confused about JDK and SDK. I have tried to find something online which can make it clear. But unfortunately, I am still confused on their relationship? It seems that they are the same thing?
Thank you for any help.

Hi there,
If I'm not mistaken, JDK no longer exists.It used to be the same thing as JSDK nowadays. It's just a matter of names, and shouldn't worry you.
See you !

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