Taxonomy is a term that represents the formal structure and hierarchical representation of information objects. It organizes knowledge to make the search and browsing capabilities of the content more functional. As taxonomy expresses hierarchical relationships, your tree-like organization of topics is taxonomy. Taxonomy is crucial for technical writing; it helps your readers find necessary information quicker and makes your documentation more effective and easy-to-interpret.
Here is an example of taxonomy:
Read how you can use taxonomy in ClickHelp.