The definition being used here for libraries and services has both being marketed to developers. We're talking about APIs, not a web product with a UI etc. Ser

The definition being used here for libraries and services has both being marketed to developers. We're talking about APIs, not a web product with a UI etc. Services, in this article, doesn't refer to things that can only be built as services (e.g. because it queries a proprietary dataset) but those that might optionally be built as services (e.g. fetching and processing otherwise accessible data) and could, as easily, be built as a library.