User comments are visitor-submitted feedback attached directly to a page, and beyond their obvious social value, they add genuinely fresh, page-relevant content that search engines can crawl and index alongside the original article, sometimes surfacing questions or angles the original content didn't cover.
An active, ongoing comment section signals engagement in a way static content alone can't: it shows real people finding a page worth responding to, which is part of why a healthy comment section can correlate with stronger performance, alongside the direct benefit of more indexed, relevant text on the page. That value depends entirely on quality, though. A comment section overrun with spam, or one nobody bothers to moderate, does more harm than good, both to the reader's experience and to how the page reads to a crawler trying to judge genuine content quality. For webmasters, comments also work as a low-effort feedback channel: recurring questions or complaints in the comments are often the clearest signal available for exactly where a piece of content is falling short of what readers actually needed.
