A voice recognition and natural language interface for a computer or mobile device. Virtual assistants such as Siri, Google Now, Cortana and Amazon Echo feature conversational interfaces. In China, where the language is much more tedious to type, especially on small keyboards, conversational interfaces are dramatically enhancing search queries. The artificial intelligence (AI) labs at Baidu, China's largest search engine, spend considerable resources perfecting speech recognition and natural language processing. See virtual assistant, user interface, voice recognition and natural language recognition.