Based on web search engine technology, Sogou Pinyin input method is
 the next-generation input method designed for Internet users. As it
 is backed with search engine technology, user input method can be
 extremely fast, and it is much more advanced than other input method
 engines in terms of the volume of the vocabulary database and its
 accuracy. Sogou input method is the most popular input methods in
 China, and Sogou promises it will always be free of charge.