The WordPress 4.4 release includes a number of features that provide improved extensibility for content. WordPress has enabled users to embed content from other sources into WordPress sites for the last six years, thanks in part to support for the oEmbed specification.The oEmbed format is a standardized API for enabling content embedding.
“WordPress has been operating as an oEmbed consumer for quite some time now, allowing users to easily embed content from other sites,” WordPress developer Pascal Birchler wrote. “Starting with version 4.4, WordPress becomes an oEmbed provider as well, allowing any oEmbed consumer to embed posts from WordPress sites.”