Long Zoom - usually around 38-135 on 35mm cameras and 25-100 on APS cameras. This longer lens is suited to people who want to magnify distant subjects. It can make the camera a bit bulkier than the smaller zooms, and may also reduce the amount of light let in by the lens (so faster films may be preferable).
However, with recent advances in lens technology there is now little disadvantage in going for one of these models, particularly if you do a lot of long-distance work.