Information architecture is the structure and hierarchy of data objects in a digital system, typically delivered in a written document to product engineers and web developers. Data in the hierarchy should be labeled and organized for scalability and efficiency.
Here's an analogy.
In the same way you organize folders on your computer so that you can easily locate files, an information hierarchy informs how data is organized inside of your digital product to help users complete tasks.
Why does it matter?
The user experience of your digital product may suffer from poorly architected objects and information.
How does it apply?
In order to build a scalable digital product, it’s important to be thoughtful in the ways you organize system objects and information.