Tracker is a flexible application that allows you to track views for channel entries from site visitors. Instead of recording views per page, Tracker records views for each time a specific channel entry is loaded. Stats are available in intervals of days, weeks, months, and years. You can view a variety of overall and filtered down stats in the Tracker module control panel area, as well as entry-specific stats in the publish page using the Tracker field type.
On the front end in your templates, you can display ranked lists of entries, stats for each entry, and charts/graphs for each entry. The tracking code that is placed in your templates is also available as a pixel image so you can track views on cached pages.
NOTE: Documentation for Tracker 1.x can be found here.