The document discusses designing voice and natural language experiences. It covers why conversational interfaces are becoming more popular now due to factors like user acceptance, advances in speech recognition, and exposure to digital assistants. It then discusses user expectations for intuitive, unobtrusive, personalized and anticipatory conversations across channels. The rest of the document outlines principles for designing conversational experiences, such as starting with the user, understanding context, getting the interface out of the way, and testing throughout the process.