JDK is a subset of the SDK. The SDK seems to contain Sun application servers (Glassfish, Tutorials, etc) refer here in addition to the contents of the SDK.
Both JRE and JDK come with the JRE (Java RunTime Environment). The JRE is required execute simple "Hello World" programs were as the JDK/SDK is required for Enterprise level development (Servlets, JavaMail etc)
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