SMIL (pronounced smile ) is an abbreviation for the Synchronized Multimedia Integration Language. It is a W3C Recommendation for describing Multimedia presentations using the Extensible Markup Language (XML). It defines timing markup, layout markup, animations, visual transitions, and media embedding, among other things.

SMIL 1.0 became an official recommendation of the World Wide Web Consortium W3C in June 1998. SMIL 2.0 became an official recommendation in August 2001. SMIL 2.1 became a proposed recommendation in September 2005. SMIL 2.1 includes a small number of extensions based on practical experience gathered using SMIL in the Multimedia Messaging System on mobile phones.

A SMIL document is similar in structure to an s.

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