The extension for Joomla to show the group of articles in a block mode, this component extracts first image and first few words or first characters (you set the number of words/characters) from the article, to make an eye-catching description with "Read More..." link.
There are a lot of settings like number of columns, styles, pagination, vertical and horizontal orientation etc. And even custom layout. So it's very good replacement for the built-in Joomla category/section blog layout.
Therefore, if you have only basic knowledge of programing or don't know it at all you can still setup the extension.