a computer program that prowls the internet looking for publicly accessible resources that can be added to a database; the database can then be searched with a search engine
<noun.communication>
Wanderer \Wan"der*er\, n. One who wanders; a rambler; one who roves; hence, one who deviates from duty.
How often has the wanderer groaned in front of those closed doors?" - Paul Claudel, French author (1868-1955).