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What is the Invisible Web? Is it some kind of Area 52-ish, X-Files deal that only those with stamped numbers on their foreheads can access? Well, not exactly. The term "invisible web" mainly refers to the vast repository of information that search engines and directories don't have direct access to, like databases. Unlike pages on the visible Web (that is, the Web that you can access from search engines and directories), information in databases is generally inaccessible to the softwarespiders and crawlers that create search engine indexes.
Perhaps you think it would be easier to just stick with what you can find with Google or Yahoo.
Maybe. However, it's not always easy to find what you're looking for with a search engine, especially if you're looking for something a bit complicated or obscure. Think about the Web as a vast library. You wouldn't expect to just walk in the front door and immediately find information on the history of paper clips lying on the front desk, right?
You might have to dig for it. This is where search engines will not necessarily help you, and the Invisible Web will.
Plus, the fact that search engines only search a very small portion of the web make the Invisible Web a very tempting resource. There's a lot more information out there than we could ever imagine.
Fortunately for you and I, there are many other people that have asked themselves the exact same question, and have put together great sites that serve as a launching point into the Invisible Web. Here are some gateways for different subjects:
There are many, many sites that are set up to dig into the Invisible Web.CompletePlanet.com is a directory of "over 70,000+ searchable databases and specialty search engines."
Most of the information on the Invisible Web is maintained by academic institutions, and has a higher quality than search engine results. There are "academic gateways" that can help you find this information. To find nearly any educational resource on the Web, simply type in this search string to your favorite search engine:
site:.edu "subject I'm looking for"
Your search will return with only .edu-related sites. If you have a particular school in mind that you'd like to search, use that school's URLin your search:
site:www.school.edu "subject I'm looking for"
Frame your subject within quotations if it is more than two words; this lets the search engine that you're using know that you want to find those two words right next to each other (for more on basic search techniques, read Web Search 101: The Basics).
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| Дмитрий Ландэ доктор технических наук, академик Украинской академии наук, член-корр. АТН Украины |
Дмитрий Ландэ,
dwl@visti.net
Оказывается в Глобальной паутине информации куда больше, чем это можно себе представить. Чаще всего пользователь находит на необходимые ему новые источники в Сети через информационно-поисковые системы, такие как Google, Yahoo! или "Яндекс", которые для многих стали "де-факто" стандартными. Однако кроме видимой для поисковых систем части вэб-пространства существует огромное количество страниц, которые ими не охватываются. При этом доступ пользователя к таким ресурсам в принципе возможен (хотя иногда "слегка прикрыт" паролями). Как правило, эти вэб- страницы доступны в Интернет, однако выйти на них трудно, а порой невозможно, если не знать точного адреса. Эти ресурсы уже десять лет как имеют собственное название - "скрытый" (deep) вэб, которое ввел Джилл Иллсворт (Jill Ellsworth) в 1994 году, обозначив им источники, недоступные для обычных поисковых систем. Сегодня такие ресурсы называют также невидимым (invisible) вэб. Они чаще всего охватывают динамически формируемые вэб-страницы, содержание которых хранится в базах данных и доступно лишь по запросам пользователей.
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