Descriptive analysis is also known as Descriptive statistics
They are procedures used to summarize, organize, and simplify data.
Descriptive function are always unsupervised
See also Data Quality - Data Profiling.
By presenting information visually and allowing dynamic user control through direct manipulation principles, it is possible to traverse large information spaces and facilitate comprehension. In a few tenths of a second, humans can recognize features in megapixel displays, recall related images, and identify anomalies.