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Describing your product or service should fit within 1 paragraph with supporting paragraphs underneath it. Most people, when dealing with something innovative or something that is identical to a competitor, try to cop out of this and say "it's just too complex for my product to be described". That's hogwash.
Every product or service can be defined. If your product or service is so innovative that it can't be defined then the chance of it succeeding is very low.