The application programming interface (API) may be an old concept, but it’s one that’s undergoing a transformation. More organizations, driven by mobile and cloud requirements, are opening their information assets to external developers. By exposing data through APIs to their developers, companies like eBay, Expedia and Salesforce are successfully achieving sales in new markets. According to ProgrammableWeb.com, the number of open APIs being offered publicly over the Internet now exceeds 19,933—up from just 32 in 2005.