# Articles

Articles explain *what* and *why* behind the CDQ APIs and the Developer Portal. For step-by-step procedures, see the [Instructions](/documentation/_public/instructions/instructions-landing-page) and the [Tutorials](/documentation/_public/tutorials/tutorials-landing-page).

## Technology

API Versioning and Change Communication
What the major version and the `x-build-version` mean, how CDQ surfaces the build version, and how the per-API changelog tells you whether a change affects you.

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