Joomla is a CMS which provides several components. One such powerful component is K2. K2 is a content extension for Joomla which is very powerful and easy to use. It is used as a replacement of the default article system in Joomla because of rich features. You can install the k2 component and import the Joomla articles. You will get new features for the existing content such as: articles with additional fields for article images,videos, other audio files, image galleries and attachments, images uploaded can be autosized to 6 configurable dimensions, comments, tagging, frontend editing with easy access control setting etc. K2 is a good solution to manage the content whether it is large or small in size. It is free to use. You can download it from http://getk2.org/.

Uses:

Nested Level categories:

K2 provides categories to manage your content. You can divides the content to categories and subcategories according to your requirement.

Commenting, integrated with Google's reCaptcha & Akismet:

It also provides a deafult comment system to every item which is not present in default Joomla article system. Also integrated with Google's reCaptcha and Akismet for security reasons.

Image Galleries: It provides image galleries to each and every item i.e, you can create a image gallery which is related to an item.

AJAX based frontend editing & comments moderation:

k2 allows you to access the items from frontend. You can edit and create new items from frontend. You can also comment to the item.

Supports Joomla API:

K2 completely supports the Joomla API i.e., any Joomla plugins will function properly inside k2 component and modules, either in frontend or backend

Google AJAX Search integration:

It also integrate the Google Ajax Search.