Wikipedia
OEmbed
oEmbed is an open format designed to allow embedding content from a website into another page.
An oEmbed exchange occurs between a consumer and a provider. A consumer wishes to show an embedded representation of a third-party resource on their own website, such as a photo or an embedded video. A provider implements the oEmbed API to allow consumers to fetch that representation.
Version 1.0 debuted on March 21, 2008. Supporting the following content types: photo, video, link and rich.