This is a "multipurpose landing page": the most common type of layout used for pages on your site.

It works well for breaking up content-heavy pages into separate sections and is your swiss army knife of page layouts. The Multipurpose page provides three separate fields for body text, each with:

• a horizontal block row beneath it (called "Articles"), and
• a sidebar beside it (called "Aside").

And remember, you can always learn more about block layouts and widths, or about the block styles that control design treatments for your blocks.