An iframe, short for inline frame, is an HTML element that allows another HTML document to be embedded within a web page. iFrames are commonly used to embed content from other websites, such as videos, maps, or social media feeds, into a web page without having to host the content on the same server. This technique enables webmasters to integrate third-party content into their websites while maintaining control over the layout and design.
http www youjizz com videos embed 205618 top : This part seems to be the source URL where the content is to be fetched from. It points towards a specific video embed link on YouJizz.
While iFrames have their benefits, there are also some drawbacks to consider:
<iframe src="http://www.youjizz.com/videos/embed/205618/top" width="width" height="height" frameborder="0" allowfullscreen></iframe>