Zeitgeist is a service which logs the user's activities and events (files opened, websites visited, conversations held with other people, etc.) and makes the relevant information available to other applications.
It serves as a comprehensive activity log and also makes it possible to determine relationships between items based on usage patterns.
This package contains the main daemon (in its new Vala implementation, codenamed "Bluebird"). It also includes the FTS (Full Text Search) extension.