Abstract
The large amount of available information on the Web makes it hard
for users to locate resources about particular topics of interest.
Traditional search tools, e.g., search engines, do not always successfully
cope with this problem, that is, helping users to seek the right
information. In the personalized search domain, focused crawlers
are receiving increasing attention, as a well-founded alternative
to search the Web. Unlike a standard crawler, which traverses the
Web downloading all the documents it comes across, a focused crawler
is developed to retrieve documents related to a given topic of interest,
reducing the network and computational resources. This chapter presents
an overview of the focused crawling domain and, in particular, of
the approaches that include a sort of adaptivity. That feature makes
it possible to change the system behavior according to the particular
environment and its relationships with the given input parameters
during the search.
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