What would sentences be without words?
Sentences makes finding out and understanding the concept and meaning of a word easy and brings out the sense in the word. Badke states that “ keywords are flat. Keyword search engines scan across the broad surface of databases looking for matches”. This situation has happened to all of us where searching for a keyword turns into an endless pit of irrelevant links that has nothing to do with what your initially are looking for.
Hierarchies makes researching so much easier. Combining words and using phrases to help narrow down your search.