This document provides an overview of the K+ Open API including what K+ is, who is using the API, how to use the API, available methods, and references/resources. K+ is Yahoo's knowledge Q&A service available in Taiwan and Hong Kong containing millions of questions and answers. The API allows developers to integrate K+ question and answer data into their applications. Authentication is required to access private user data and methods. The document provides links to the API documentation and registration process.