Computers are difficult to use because they are very good at processing digital information (e.g. numbers) and not very good at understanding the complexities and subtleties of human language.
For example, if you type a social security number into a form and click 'OK', your computer will go find it. But, if you ask your computer: My car is making an unusual sound. Could you please tell me what's wrong with it?, your computer - of course - won't provide any useful information. (or, if you use a search engine, it might provide a lot of information, but very little of it will be useful.)
But, if we have a special computer that can understand our language, and our computer is very patient and listens quietly to an automobile mechanic as he has conversations with his customers, and the conversations can be stored - digitally - as two-part documents: a multi-threaded context document and a response, then, at some point, the computer would be able to provide intelligent answers and - more importantly - after a lot of listening, the computer would be able to carry on a meaningful conversation.
DNLE is important because it provides the essential language engine that (1) understands the meaning of a collection of words and can efficiently store a digital content signature of that meaning, and (2) given a search document, can quickly find the single most similar document (based on meaning) in a large-scale document library.