trees show hierarchical data. File directory navigation is one of the most familiar UX for browsing a tree.

There are numerous variations on presentation of a tree:

Protovis Hierarchies

(above examples from Protovis library)

Here's a more complete visual gallery of some of the methods.

The tags are closely related to the tree tag, with the master-details typically being a tree of fixed depth, usually two. Here are:

Creating a 'tree' question

Try to get whatever is special about your tree question into the question title. We've already had questions about large trees and deep trees and about what the options are. If it's not clear your question is different you'll get pointed to those.

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