When did you first start thinking about connecting mapping and other data?

This excerpt is from the QGIS Project's Documentation » A Gentle Introduction to GIS » 2. Introducing GIS

"A common feature of GIS [Geographical Information Systems] is that they allow you to associate information (non-geographical data) with places (geographical data). In fact, the GIS Application can store many pieces of information which are associated with each place –– something that paper maps are not very good at. For example, [a hypothetical] health care worker could store a person’s age and gender on her table. When the GIS Application draws the layer, you can tell it to draw the layer based on gender, or based on disease type, and so on. So, with a GIS Application, we have a way to easily change the appearance of the maps we created based on the non-geographical data associated with places."

For many people, Pokémon GO was the first time they'd really been conscious of a connection being made between geospatial mapping and other data.

Can you think of an app or tool you've used that was built on GIS?
When did you first start thinking about connecting mapping and other data?