Put simply, database indexes help speed up retrieval of data. The benefit of indexes is that your computer doesn’t have to work as hard to retrieve data. They're like book indexes, providing quick jump points to the full reference.
Thank you, that explanation is appreciated.
Do you know if these indexed data bases keep growing to some monumental MB storage ? C&C obviously consider they need deleting as they include them on their kill list. It seems that they serve a similar purpose to cookies, which we do not allow to grow indefinitely and clean out frequently.
Cookies perform the same definitive function as you describe for indexed data bases.