Difference between JDK/JRE

Guys,
I need to know the difference between JDK and JRE? When should one use JDK and when one should use JRE. What is the advantages/disadvantages of using one over other.
Cheers,

Shutt up guys... one person is to know some thing about JDK/JRE, and you.....
Any way
Hi tnischal!
Your question was about JDK/JRE
JDK = Java Development Kit
JRE = Java Runtime Environment
JRE is a comolete Setup of J2sdk1.4.1(LatestVersion of JDK(1.4.1) with other requirements to use this version included JDK1.4.1,JavaWebStart,SunJVM,Java2PlatForm, and all other needs for it.
while JDK is only the Software Development Kit. Previous versions of JDK than V1.4.1 did not need the all Runtime Environment for JDK, You just copy the JDK Folder in your machine and use it
But you can't use JDK1.4.1(fully) without other requirements of use it.
Hope you got the difference now.

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