What headless means and when it pays off
In a traditional store, the platform renders the pages and runs the business logic together. In a headless build, the commerce engine exposes its data through an API, and a separate storefront application renders the pages. Shopify offers this through its Storefront API, and many other commerce engines work the same way.
That separation costs more to build and to maintain than a theme, so it should earn its place. It pays off in four situations: your design needs go beyond what a theme can do, you sell through several channels from one catalog, your performance targets are strict, or you need control over hosting and data location. If none of those applies, a well-built theme on Shopify, Salla or Zid will get you to market faster and cheaper.
We say this plainly in discovery. Some clients leave the call with a recommendation not to go headless, and that is the right outcome when a theme does the job. The honest comparison covers build cost, the team you need to run it, and the speed of change after launch.
