What are the features of web crawlers?

*

User satisfaction from search directed access to resources and

easier browsability (via maintenance and advancements of the Web

resulting from analyses).

*

Reduced network traffic in document space resulting from

search-directed access.

*

Effecting archiving/mirroring, and populating caches (to produce

associated benefits).

*

Monitoring and informing users of changes to relevant areas of

Web-space.

*

"Schooling" network traffic into localised neighbourhoods through

having effected mirroring, archiving or caching.

*

Multi-functional robots can perform a number of the above tasks,

perhaps simultaneously.