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What Is the Difference Between IDX and VOW?
I did not know the difference until I read this blog.  Interesting stuff here.  
IDX is an umbrella term for technologies that connect a real estate website to an MLS, including iFrames, FTP, RETS, and RESO Web API. VOW also connects a website to an MLS, but because it includes more data than a typical IDX, it is usually considered apart.
The Internet has changed the way many real estate agents do business. Beginning in the 1990’s, agents began seeking to market more listing online. To do so, agents needed a secure link to the MLS that allowed them to display listings on their website, but also update them as the MLS changed.
Both IDX and VOW were born out of this need, though each serves a different purpose. This article will review IDX and VOW in detail to help you understand the difference between the two.
LUKE’S TIP: 
 
What Is IDX? IDX, or Internet Data Exchange, is the rules, licenses, and technologies that allow real estate agents to access MLS listings, integrate them into their websites, and display them publicly.
IDX is built on the concept of Broker Reciprocity or the idea that any broker that opts into IDX grants the right to all other participants to display his listings and ... more

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