IDL is a language for defining what operations are available and how they should be invoked for each remote object.
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An IDL definition defines types of objects, their attributes, the methods they export and the method parameters.
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IDL supports Object-Oriented concepts such as encapsulation, inheritance and polymorphism.
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Each language mapping of IDL should be the same for all ORB implementations.
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The language mapping includes language-specific data types and procedure interfaces.
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An IDL unit is called a module and contains a set of class interfaces containing attributes and methods (similar to Java interfaces with variables and methods.)
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