J2SE download page: JRE and SDK differences

when we go to the J2SE download page: http://java.sun.com/j2se/1.4.1/download.html#docs, we will see JRE and SDK column. What are the differences??
My guess is:
JRE just download the java runtime environment, without downloading the java compiler. JRE means the JVM here?
SDK downloads everything, including the compiler and run time environment.

when we go to the J2SE download page:
http://java.sun.com/j2se/1.4.1/download.html#docs, we
will see JRE and SDK column. What are the
differences??
My guess is:
JRE just download the java runtime environment,
without downloading the java compiler. JRE means the
JVM here?
SDK downloads everything, including the compiler and
run time environment.SDK is a development kit, where You have java compiler and all the rest +
jre.

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