Why does the JDK come with a JRE and JDK?

I was wondering why when I download the JDK does it install a JRE and JDK. The JDK (I believe) includes all the JRE files as well as the compiler files. I can just as easily get rid of the JRE and as far as I know it wouldn't make a difference so why both?

I thought it was a 2-for-1 deal ;-)
Seriously, it doesn't make sense for me either. What
would make more sense
is for the JDK installation to install that separate
JRE, but to use that JRE instead of
installing a second one inside its folders.That would make much more sense, but I am guessing there is some intracacies that I'm not aware of or speed reason or something of the sort that would explain this. The first thing that comes to mind is knowing people might be copying the jre, someone might accidentally pull the jre out so they still wanted the sdk to work with the built in one. This is a pretty big stretch i know but there must be a reason somewhere.

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Why does the JDK come with a JRE and JDK?

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