Pro Tools lets you link or unlink Track selection with Edit selections.
When Track and Edit selections are linked, you can make a selection within a track or across multiple tracks for editing and each associated track is selected (track names automatically highlight). This lets you quickly apply track-level commands (such as Track View toggle, change track heights) and have the command apply to all tracks you are working on.
When Track and Edit selections are unlinked, making an Edit selection does not automatically select all associated tracks.