The Desktop API (previously known as the Skype Public API – Application Programming Interface) enables third-party applications to communicate with Skype.
These applications can be hardware products or software applications, but they're all created by developers who use the Desktop API, a text-based protocol, to interact with Skype software. The Desktop API is designed primarily to help developers manage calls from outside the Skype application.
Important: As communicated in this blog post, due to technology improvements we are making to the Skype experience, some features of the API will stop working with Skype for desktop. For example, delivery of chat messages using the API will cease to work. However, we will be extending support for two of the most widely used features – call recording and compatibility with hardware devices – until we determine alternative options or retire the current solution.
These changes to the Desktop API will not impact any core Skype features, and your Skype for desktop clients will continue to be supported as we release new features and improvements to enhance your Skype experiences.