Chunk:Help screen column header Blog Layout
From Joomla! Documentation
A Blog Layout in Joomla! has 3 main areas: Leading, Intro, and Links. These are shown in the diagram below.
Articles in the Leading Area always display in 1 column, using the full display width. Articles in the Intro Area may display in 1, 2, or 3 columns, depending on the Columns setting. The parameters below control the number of Articles in each area and the order in which they display. If an Article has a "Read more..." break, only the text before the break (called the Intro Text) will display, along with a "Read more..." link.