The structure view shows the hierarchy of the document being created in Kile and allows the user to quickly navigate the document and shows segmentation of the document. To navigate around your document all a user needs to do is to left-click on any label, chapter, section, subsection, etc. and you will be taken to the beginning of the corresponding area.
When using the structure view, you can easily jump between labels, sections, and subsections by clicking on the item in the structure view and you will be taken to that section in the editor view. Sections and subsections are clearly marked with special characters that make them easy to identify.
If you include a file into your LaTeX document using the \input or \include tags, the structure view will contain an item representing this file. Double-clicking on the file name will cause Kile to display this included file.