The full form of SALT is Speech Application Language Tags. It’s used on Computing ,Internet in Worldwide

The Speech Application Language Tags (SALT) technology was created in 2001 by Cisco, Comverse, Intel, Microsoft, Phillips, and Speechworks. These companies, along with many others, have formed the SALT Forum to oversee future development and standardization of the SALT specification. Their goal is to provide a royalty-free, platform-independent standard for creating multimodal and telephony-enabled applications that can be accessed from PCs, telephones, and PDAs. SALT is a technology for extending common markup languages (including HTML, XHTML, cHTML, WML, etc.) with a spoken dialog interface for Internet applications. It is designed for both voice-only applications and multimodal applications that combine voice and visual displays.

Speech Application Language Tags(SALT) is an extension of HTML and other markup
languages (cHTML, XHTML, WML) which adds a spoken dialog interface to web applications,
for both voice only browsers (e.g. over the telephone) and multimodal browsers. It was
developed by – Microsoft, Cisco, SpeechWorks, Philips, Comverse and Intel. The SALT
specifications developed by the SALT forum http://www.saltforum.org were later
contributed to the W3C (http:// www.w3.org).
The major scenarios of the SALT are Voice- Only Browsers and Multimodal Browsers.
For multimodal applications, SALT can be added to a visual page to support speech input
and/or output. This is a way to speech-enable individual HTML controls for ‘push-to-talk’
form-filling scenarios, or to add more complex mixed initiative capabilities if necessary.