Last week, I found Kimono, a web-app that lets you turn any web into a API, saving time from manually scraping a web from which we want to extract raw data to use in our own application.
Recognize similar data. Automatically structure it.
The video shows a simple example of how one can turn a ranking list on a website to an API in JSON format.
Definitely, Kimono is a good way to start understanding the concept behind APIs if you are not familiar with its technicalities.
The song that accompanies the promotional video is Deep East Music - Get Together