What are categories?
Categories group posts into general topics. Readers can browse specific categories to see all posts that contain similarly related content. Categories are required for posts. Each site has a default category that gets applied to a post should you forget to create or attach one. You can place a post under more than one category. Click here for instructions on how to put a post into a category.
Manual: v5 – Pages 169-176, v6 – Pages 84-87 Categories are essentially a visual way of organising your records. They can mirror the disk locations, indeed you can create Categories from folders when cataloguing images (set via Cataloging Options -> General tab). However, you can also create your own Categories from scratch and then link records to them. The manual doesn’t state but ought to, that moving a folder position (certainly of a folder ‘representing’ a real disk location) on the list does not move that folder and its contents on the system. Whilst such behaviour isn’t intended there are doubtless plenty of users who guess this is the case – especially if the folders were created as part of the cataloguing process. You can alter the name and hierarchy of your Categories or add and delete them as you wish.