Content syndication is when web-based content is re-published by a third-party website. Any kind of digital content can be syndicated, including blog posts, articles, infographics, videos and more. Think of it as a kind of barter arrangement. The third-party website gets free, relevant content. The content creator gets free exposure and publicity, and backlinks to their own website, which in turn boosts their organic traffic.
Syndication in the media industry is not new. Before the internet, newspapers and magazines with large circulation and readership sometimes printed syndicated content provided by smaller publications and freelance writers. Both benefited. The small player got to reach a much wider audience and hopefully attain a measure of fame; the large publication got more content – without having to invest resources in creating it.