Interoperability, with regards to technology, is the ability for software/hardware to be implemented over many platforms without much complication. One example that comes to mind are web based mobile applications. One of the benefits of designing a mobile application using HTML and CSS, it that it will be able to run on any device and platform which has access to a browser, and presumably an internet connection. In contrast to that, applications which are inoperable would be ones build in Swift, for example. Swift is designed to be used for iOS applications, which means they won't be able to be deployed to Android or Windows devices.
