As you know there are great changes in today's real estate tech market. In June, 2018 RESO stopped supporting RETS officially and offered to convert to RESO Web API, "the next advancement that realtors deserve today". It is built on more efficient, open technology standards. Consequently RESO Web API technology is gradually replacing RETS (Real Estate Transaction Standard). Even though RETS is still being used by majority of MLS providers, more and more MLS providers have to become RESO Web API compliant and announce their dates of switching to Web API. So what's the real difference between these technologies?