Software, as the mechanism by which computers operate, is discrete in its nature. As such, it applies discreteness to every element in the environment, representing the world and the built environment in a discrete manner, and operating with people following digital principles, namely neglecting any form of continuous dimension. The digital/physical public space is regulated by algorithms that, by their nature, consider the built environment, the commons and people as individual entities, following a binary logic. The discrete city is structured by the digital logic, represented and understood through 1s and 0s and everything that is ineffable, ethereal and abstract is routinely converted into digital formats in order to be represented and become something to be shared with the other actants. The urban space is discrete, as algorithm-based digital processes determine the configuration and appearance of the physical space and the objects in the built environment. The chapter also presents an overview of the key concepts discussed in this book.