Post Formats is a theme feature introduced with Version 3.1. Post Formats can be used by a theme to customize its presentation of a post.

Lorem ipsum dolor sit amet, con­sectetuer adip­isc­ing elit. Aenean com­mo­do ligu­la eget dolor. Aenean mas­sa. Cum soci­is natoque penat­i­bus et mag­nis dis par­turi­ent montes, nasce­tur ridicu­lus mus — more on WordPress.org: Post For­mats