RSS (Really Simple Syndication) allows users to subscribe to frequently updated content like blogs and news feeds. It provides advantages like parsing information quickly, discovering new content serendipitously, and being the first to share new information with colleagues. While RSS has some disadvantages like requiring additional software and not all sites supporting it, it is useful for PR professionals to monitor clients' blogs and journalist blogs for coverage. PR can promote releases through RSS and enable two-way conversations by using wikis, blogs, and social media alongside RSS.