An RSS feed is a standardized XML format originally designed to syndicate blog posts and news headlines as a list of dated items, each with a title, link, and description, so that any RSS reader or aggregator could display updated content without a person visiting the source site directly. The format predates modern shopping feeds by more than a decade, but its basic structure — a channel wrapping a series of items — turned out to be flexible enough that shopping platforms adopted it as one of their accepted product feed formats. An RSS feed is, in that sense, both a content syndication tool and, with the right extensions, a valid way to submit a catalog to a shopping channel.

Why an RSS Feed Matters Beyond Blogs

Most people encounter RSS as the technology behind podcast subscriptions or news readers, but for e-commerce operators it matters because Google Merchant Center still accepts RSS 2.0 as one of its supported feed formats for submitting product data, alongside more common tabular formats. That overlap means a business already publishing an RSS feed of some kind — for a blog, a deals page, or a content hub — is working with a format structurally close to what a shopping feed needs, just extended with commerce-specific tags. Understanding RSS also matters for feed distribution generally: it's a useful reference point for how syndicated data gets pulled by outside systems on a recurring basis, which is the same mechanical problem a product feed has to solve.

How an RSS Feed Works

An RSS feed is built around a single <channel> element containing metadata about the feed itself (title, link, description), followed by a series of <item> elements, one per entry. Each item traditionally carries a title, a link, a description, and a publication date, which is enough structure for a news reader to render an updated list. When RSS is used for product data instead of articles, the same <item> skeleton stays intact, but it's extended with the g: namespace tags — g:price, g:availability, g:gtin — that Google's product feed specification defines, turning a syndication format into a functional shopping feed.

Example: An RSS Feed Extended for Product Data

<rss version="2.0" xmlns:g="http://base.google.com/ns/1.0">
  <channel>
    <title>Example Shop Product Feed</title>
    <link>https://example-shop.com</link>
    <description>Product listings for Example Shop</description>
    <item>
      <g:id>SKU-55810</g:id>
      <title>Linen Blend Overshirt - Olive, L</title>
      <link>https://example-shop.com/products/linen-overshirt-olive-l</link>
      <description>Relaxed-fit linen blend overshirt in olive green.</description>
      <g:price>72.00 USD</g:price>
      <g:availability>in stock</g:availability>
    </item>
  </channel>
</rss>

The <channel> and <item> tags here are pure RSS; everything prefixed with g: is the commerce extension layered on top, which is exactly how Google's RSS 2.0 product feed option is built.

Related Concepts

An RSS feed is one specific implementation of the broader idea of a feed, and understanding it clarifies why content syndication and product syndication share so much underlying mechanics — both depend on a receiving system pulling structured, dated entries on its own schedule. That same pull-based mechanism is what feed distribution automates at scale, regardless of whether the payload is a blog post or a product listing.