Stack & heap - but that was not good enough they wanted more detail, which I did not know. However upon looking it up the answer using Google this might be the correct answer: The JVM memory consists of the following segments: Heap Memory, which is the storage for Java objects. Non-Heap Memory, which is used by Java to store loaded classes and other meta-data JVM code itself, JVM internal structures, loaded profiler agent code and data, etc.