A concordance line brings with it information about which segment of the text it was found in.
In the screenshot below, a concordance was carried out; the listing has been sorted by Sentence Position. The advantage of this is that it is possible to identify search-words occurring near sentence starts, near the beginning of sections, of headings, of paragraphs.
(With the settings when this concordance was computed, no headings were identified because there was no suitable mark-up in the plain text, so the heading position and number for each line is blank.)
See also: Start and end of text segments.