Define IT infrastructure as shared technology resources—hardware, software, and services—using the city and house-foundation analogies.

Moore’s Law, mass digital storage, Metcalfe’s Law, plus falling communication costs and standards that make tech cheaper and more connected.

First two ecosystem components: client machines, servers, mainframes, and OS platforms from Windows and Linux to Android and iOS.

Enterprise software and middleware, database and storage platforms, and networking/telecom that connect the islands.

Infrastructure is strategy, not just servers—build on the foundation with confidence.