Sections represent significant self-contained parts of the timeline. Common examples of a section are a verse, a chorus, or a bridge in a song.
Currently, sections are exposed as editor actions that are available when a range is selected on the timeline:
When Ardour treats a range as a section, it cuts or copies audio and MIDI data and their automation (hidden or visible) across all tracks, as well as markers and unused playlists. When pasting the cut or copied data, it ripples all tracks at the edit point. It's also possible to repeatedly copy and paste an existing section.