What it is

Jekyll is a blog-aware static site generator written in Ruby and released under the MIT license. It takes content written in Markdown together with Liquid templates and renders a complete static website that can be served by Apache, Nginx, or any other web server. The project describes itself as a file-based CMS without the complexity of a database-backed one, and it is the engine behind GitHub Pages, which hosts sites directly from GitHub repositories. It lives in the Ruby ecosystem, is distributed as a gem, and has been developed for roughly eighteen years.

The concrete problem it solves is the gap between writing and publishing. A writer who wants a blog or a project site normally has to run a server, a database, and an administrative interface, or hand over control of the content to a hosted platform. Jekyll removes that layer. Content stays as files in a repository, templates control presentation, and the build step produces plain HTML that any web server can deliver. Because the output is static, there is no runtime application to keep alive, and because the source is text, the site can be versioned, reviewed, and migrated like any other code.

Key capabilities

• Renders Markdown content and Liquid templates into a complete static website.
• Supports front matter, the metadata block that drives per-page and per-post behaviour.
• Exposes site variables for use inside templates.
• Generates posts with customizable permalink structures.
• Provides built-in Liquid extensions for common templating tasks.
• Accepts custom plugins that generate content specific to a site.
• Ships migration tooling for importing content from previous systems.

Who uses it and how

• Individuals running personal blogs, where posts are Markdown files committed to a repository.
• Project and organization sites that publish documentation and release notes as static pages.
• GitHub Pages users, who get Jekyll as the build engine for sites hosted from their repositories.
• Teams migrating from an older publishing system, using the documented import path to move existing content.
• Template authors and plugin developers extending the generator for site-specific output.

Getting started

Install the gem, then follow the usage and configuration documentation at jekyllrb.com. GitHub Pages offers a hosted route for sites built from a repository.

When to use it — and when not to

Jekyll suits anyone who wants content in version control and output that needs no application server, and it is the natural choice when the site is destined for GitHub Pages. A self-hoster operates the Ruby toolchain and the build step rather than a database or mail service, since the result is static files. The main caveat visible in the project data is the size of the open issue backlog, currently 258, which is worth weighing against the project's long history and active release cadence.