The experiencce of applying API resources and capabilities in desktop, web, mobile, device, and artificial intelligence applications. The design, delivery, and sustainment of APIs will define the experience of how they end up being used within applications by developers. Different types of applicaitons will have different needs of APIs, and the experience of developing applications will require perpetual alignment with developers to streamline. The experience of developing, but also using applications, will be downstream of functional or dysfunctional API lifecycles.