A Category is a group of items. Each item within a category can have detailed information recorded against it. Items are created within a category by either tagging the text using the Production Items Sidebar, or by using the Add Item command. Categories get various colours.
The categories Celtx provides are:
Celtx allows you to ignore categories, by removing them for your project using the Options dialog. Sections of each category can be collapsed down (or hidden) using the -/+ buttons next to each section.
Source(s): Features support
- Script Breakdown at Wikipedia