Sure. First off reference here: https://smt.steem.io

SMTs are essentially a new way in which Steem will permeate into the infrastructure of the existing world or in new concepts altogether. An example of potential old world penetration is something like The New York Times - integrating the Steemit model into an active community (biz gains income from hodl'ing steem, a new interactive economy for its community, and a means to incentivize activity). A new world concept is like APPICS, which is coming soon. Which is like Instagram meets the steemit model - paid community for posting instragram like activity. Each SMT is interchangeable and based on Steem but effectively serves as branded steem tokens named as whatever the platofrm wants. Basically Steem will serve as the Ethereum of social media and advertising. It will also be the paired trade on internal exchanges with incorporated money maker buyers and sellers built in.

Read more on the link to better understand. Wish you the best. :)