For the providing site, syndication increases exposure. That's a fact.
This generates new traffic for the transmitting sitemaking syndication an easy and relatively cheap, or even free, form of advertisement.
As search engine optimization has become an increasingly important topic among website owners and online marketers, content syndication has become a highly effective strategy for link building.
Links embedded within the syndicated content are typically optimized around anchor terms that will point an optimized link back to the website that the content author is trying to promote. These links tell the algorithms of the search engines that the website being linked to is an authority for the keyword that is being used as the anchor text.