A section is the top organizational level in Joomla.  It holds categories and articles.  Categories divide sections into smaller groups. For example, this article is in the section Tutorials Database, which holds all tutorials in all categories.  This article is also in the category Joomla.  So if you only wanted to see Joomla tutorials you would navigate to the Joomla category in the Tutorials Database section.

The following steps are used to delete a Section or Category:

1) Once you are in the Section or Category Manager (see How to Add a Section or Category, Step 1), place a check in the box of the article(s) you would like to delete.

2) Click the "Delete" button.

The section or category will be permanenetly deleted instantly, so double check that you are deleting the correct one(s).