AI Is Transforming Google Search. The Rest of the Web Is Next – WIRED

The truth is that even the experts don't completely understand how neural nets work. If you feed enough photos of a platypus into a neural net, it can learn to identify a platypus. If you show it enough computer malware code, it can learn to recognize a virus. If you give it enough raw language--words or phrases that people might type into a search engine--it can learn to understand search queries and help respond to them. In some cases, it can handle queries better than algorithmic rules hand-coded by human engineers.