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This check ensures that code to be executed does not violate various semantic rules of the Language and its runtime
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In particular check that pointers are legal, access restrictions obeyed and types correct
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a .class file consists of some overall information including a magic number, versioning information, a constant pool, information about the class itself (name, superclass etc.), information about fields and methods with the byte codes themselves, debugging information.
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The byte codes are essentially machine language for an idealized stack based machine which are translated into true machine code
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Note such stack based machines are not necessarily best for optimized performance. Compilers use rather different intermediate representation
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