Temporary files are the ones that are created by applications and placed in the Temporary Items folder.
In earlier versions of the Mac OS, getting rid of temporary files was generally and automatic process. However, Mac OS 9 doesn't seem to do this as well. Eradicator assists you in finding these files and then lets you delete them.
After these files are deleted, you have hard drive space available for more important items, like all those MP3s.
Please read the documentation for clear details on how to use Eradicator. It's really an easy process, and it's free.
Requirements: A PPC-based Macintosh; 2 MB of free RAM; MacOS 8.x or greater. International OS users: Users of international (non-English) versions of the Mac OS may not be able to utilize the "Cleanup at Startup" feature of Eradicator 1.6. A future version will hopefully resolve this issue. International users will still be able to take advantage of the "Temporary Items" features and related bug-fixes.