Online resources

The links below will take you to useful online reference sources, e.g., Encyclopedias, Dictionaries, Glossaries, etc. This list will be updated as and when new sources are found.

Some of the links also have interesting animations or videos explaining important concepts.

Please note that some sites may become defunct over a period of time. Also, since these sites are free to use, they may contain advertisments.

Teachers and students are welcome to suggest the addition of new sources. Send a mail to with your suggestions. Click on a link to go to the source.

Encyclopedias and General Knowledge

  • Wikipedia - the World's free and collaborative encyclopedia

    Wikipedia is a multilingual, Web-based, free content encyclopedia project. The name Wikipedia is a portmanteau (combination of words and their meanings) of the words wiki (a type of collaborative Web site) and encyclopedia. Wikipedia's articles provide links to guide the user to related pages with additional information.

    Wikipedia is written collaboratively by volunteers from all around the world. Since its creation in 2001, Wikipedia has grown rapidly into one of the largest reference Web sites, attracting at least 684 million visitors yearly by 2008. There are more than 75,000 active contributors.

  • Encyclopedia Brittanica

    Encyclopædia Britannica, Inc., headquartered in Chicago, Illinois, is a leading provider of learning and knowledge products and one of the world's most trusted sources of information on every topic imaginable.


    FreeRice has two goals: allows you to increase your knowledge of English lngauge and vocabulary, Mathematics, Geography and Chemistry while you play a game of answers. For every right answer, 20 grains of rice are donated to the United nations Food Programme to help feed the poor. FreeRice is a sister site of partnering with the Berkman Center for Internet & Society at Harvard University and the United Nations World Food Program.

    This is made possible by the generosity of the sponsors who advertise on the site.

    1. Provide education to everyone for free.

    2. Help end world hunger by providing rice to hungry people for free.


An English dictionary with multilingual search. You can either enter a word (or the starting letters) and see its meaning in English or transalte the word into another language, e.g, French. The site also has many interesting links, like 'Word of the Week, a blog for word lovers and so on. The site is very children-friendly.

Science and Technology in General

Biological sciences

Animal Diversity Web (ADW) is an online database of animal natural history, distribution, classification, and conservation biology at the University of Michigan Animal Diversity The site has accounts of thousands of animal species. These may include text, pictures of living animals, photographs and movies of specimens, and/or recordings of sounds. Students write the text of these accounts and we cannot guarantee their accuracy.

Descriptions of levels of organization above the species level, especially phyla, classes, and in some cases, orders and families. Hundreds of hyperlinked pages and images illustrate the traits and general biology of these groups. Professional biologists prepare this part.

Earth Sciences

One of the best sites and a favourite TV channel for high quality educational content about various aspects of the physical, natural and spatial environment.



Digital Libraries