Lesson 3   Yahoo! Browsing - Basics


       Yahoo!'s hierarchy is made up of categories that follow the structure of general to specific. The chart below shows the fourteen top-level categories.

Arts & Humanities                    
Business & Economy
Computers & Internet
Education
Entertainment
Government
Health
News & Media                    
Recreation & Sports
Reference
Regional
Science
Social Science
Society & Culture

       Everything contained within Yahoo! lives somewhere in these 14 categories. Each of these categories has a group of sub-category. For example the Science category contains the sub-categories Astronomy, Biology, Engineering, Journals, etc. Some of these sub-categories are listed below the top-level categories like this:

       If you want to see additional sub-categories you can click on the link for that category. Each subcategory in turn has sub-sub-categories, which in turn may have sub-sub-sub-categories. There are several levels of categories beyond this. In order to find the site and the corresponding information you want follow the general categories to the specific categories. Yahoo has over 25,000 categories beneath the main 14 categories and has over half a million sites spread across all of these categories.

       Sometimes a category, or a site, fits in more than one place. For example, while it makes sense for Physics of Amusment Parks to exist in Science: Physics: , it also makes sense that the category exists in Entertainment: Amusement and Theme Parks: . This is done by linking, or cross-referencing, the category. You'll find cross-referenced categories throughout Yahoo!; they're the ones that have the @ sign after the title. If, while browsing the database, you come across anything followed by the @ sign, think this: The category is linked (cross-referenced) and lives in more than one place in Yahoo!

The following lesson will guide you through several practice exercises.


Next: Lesson 4 - Yahoo! Browsing - Exercises
Previous: Lesson 2 - An Introduction to Yahoo!

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