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When you look at a dataset page (e.g. pick one from the datasets list), you will see 3 tabs:
The Data section is the way to explore and view the main contents of the dataset through the website. The About section presents a description of the dataset and other metadata that helps you know how to interpret the data and how you can use it. The API section is aimed at developers and analysts who want to query the data or view all details, presenting machine readable metadata about the dataset.
Most pages in this site have an API tab which includes contextual details of how to access the data programmatically. The API tab on the Getting Started help page describes some overarching principles.