For example: Type tool is a tool to add type (text) to your images and Character and Pharagraph panels gives you full control over text and text-box appearance.
its just like classification what could be similar and has characteristics what is used on the outside is grouped saying the outside tools and the inside tools are grouped saying the inside tools.EG....
All tools like Move tool, Brush tool, Type tool live in Toolbox or tool panel as you say. It is one of most panels in Photoshop, you can not access tools in Photoshop from any other panel in...