Why is rhino horn so valuable?

Could you explain, in layman's terms, why rhino horn has become such a highly sought-after commodity? Is it due to its unique properties, or is there some other factor driving its value up? Additionally, what impact does the illegal trade of rhino horn have on the conservation efforts of these majestic creatures? It's crucial to understand the underlying reasons behind its value in order to combat the illegal trade and protect rhinos from extinction.