Information about class files debugging information

Hi,
As known, when compiling "javac -g ..." the class files contain debugging information.
my Naive question is WHAT is this information?
could you please add any links to articles about this debugging information?
Many thanks!!

http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html#22856
http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html#5956

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