Drill down

(Computers) ability to move quickly through a hierarchy of folders or secondary directories

In information technology, to drill down means to move from summary information to detailed data by focusing in on something.To drill down through a series of folders, for example, on a desktop means to go through the hierarchy of folders to find a specific file or to click through drop-down menus in a GUI. Clicking on an item moves you to a level of greater detail. When an online user accesses more and more pages of the Web site, he or she goes deeper into the content of the site. As a surfer goes further into a website, he or she goes deeper into the back pages and thus deeper into data.
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Data drilling (also drill-down) refers to any of various operations and transformations on tabular, relational, and multidimensional data. The term has widespread use in various contexts, but is primarily associated with specialized software designed specifically for data analysis.
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