INTERNET INFORMATION SOURCES

BYSOFI GH JEELANIROLL NO:-11

INFORMATION SOURCES

• An information source is a source of information for somebody, i.e. anything that might inform a person about something or provide knowledge to somebody.

• Information sources may be observations, people, speeches, documents, pictures etc.

DIVISIONS OF INFORMATION SOURCES

INFORMATION SOURCES

DOCUMENTARY

PRIMARY SECONDARY TERTIARY

FORMAL INFORMAL

NON-DOCUMENTARY

INTERNET INFORMATION SOURCES• SEARCH ENGINES• E-AGGREGRATORS• SUBJECT GATEWAYS• MAILING LISTS• DIRECTORIES• DATABASES• E-TUTORIALS• ETD’S• E-BOOKS • SOFTWARES AVAILIABLE ON INTERNET

MAILING LISTS

•Also known as Discussion Forums ,discussion lists

•A mailing list is simply a list of e-mail addresses of people that are interested in the same subject, are members of the same work group.

•E-mail is used to set up informal discussion forum among members of specific interest over a network

•Forum software (Listserv) maintains a list of e-mail addresses of all members .

•Most of the mailing lists allow searching and extraction of earlier messages

•It is thus an electronic distribution of topic.

•EXAMPLE www.lislinks.com

MAILING LIST

MODERATED UNMODERATED

MODERATED MAILING LIST• having moderator to filter ,approve or edit messages before distribution• these lists are often professional in nature

UNMODERATED MAILING LIST• no moderator is present to filter ,edit or approve messages or emails• all emails/messages are distributed to all members of the list through email

automatically

SEARCH ENGINES• A search engine is a software that searches through a database of

webpages for specific information.• Search engines have very huge databases.• There is no assurance of quality contents

Examples:- • Google• Yahoo• Webcrawler• Altavista• Lycos• bing

GOOGLEIt is one of the most used & popular search engine having many unique features.Major features are:- • Google books : www.books.google.com

With Google Book Search, you can quickly search almost the full text of a book. • Google Scholar :

Google Scholar helps you search and find academic papers, abstracts and other scholarly sources – all with the speed and accuracy of Google search.• Google translator :

It allows a user to change the text or website available in any language to the known language. for changing the website language we have to provide the URL of the website.• Google images:

this feature of Google helps us to search any image. We just have to give the related keyword for the image.

E-BOOKS/ONLINE BOOKSTORES• •E-books/online texts can be viewed online Can be searchable by author, title, subject

• •Books are available in many formats such as PDF, DOC, HTML.

• •Orders can placed for books through online bookstores Examples• www.amazon.com, • www.altbookstore.com • www.booksamillion.com • www.abebooks.com

DIRECTORIES• They are organized list of information sources on web.• Arranged alphabetically or follow a classified listing. • Allow to browse through them as well as searchable • They are organized by IT experts.• They are smaller than search engines. • There are free as well as fee based directories available on

internet.free based--- www.doaj.com fee based---- www.ebrary.com

• It is a type of directory which lists the journals which are free of cost.

• It is covering almost all subjects and many languages. • URL :- http://www.doaj.org

• It is an online library of full texts of over 70,000 scholarly eBooks

• It is commercial in nature• URL :- www.ebrary.com

SUBJECT GATEWAYS• They are organized list of information sources• Resources in subject gateways are selected & organized

by subject experts• Provide more relevant information or quality content than

subject directories & search engines.• Databases are smaller than both search engines and

directories

E-AGGREGRATORS• E- aggregrators are large publishing houses available

on the web and provide access to e-journals, databases and books.

• They provide access to their own sources and the sources collected from small publication houses.

• EXAMPLES:-• emerald (www.emeraldinsight.com)• science direct (www.sciencedirect.com) • springer link(• taylor and francis• kluwer

• It is an E-aggregrator or E-publisher providing journals, books.

• it is responsible for publication of quality contents in a subject.

• It is commercial in nature.• Allow to browse through them as well as searchable• It provides full articles , abstracts in many formats i.e.

HTML,PDF.• URL :- www.emeraldinsight.com

EMERALD

THANK YOU