The name comes from its ingredients: JavaScript, APIs and Markup. Instead of a server building each page from a database when someone visits, the site is built in advance and the finished files are served from a content delivery network close to the visitor. Content usually comes from Markdown files or a headless CMS, and features such as forms or search come from specialized services.

The benefits are speed, a much smaller attack surface, and hosting that absorbs traffic spikes without extra servers. The trade-offs are a rebuild whenever content changes and more reliance on third-party services for anything dynamic.

Jamstack describes an architecture rather than a product, and modern frameworks such as Astro mix prebuilt pages with server rendering where a page needs it. For most marketing and content sites, building pages in advance remains the simpler and faster default.

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