BD-5491: Content Optimizer user docs

_docs/_user_guide/brazeai/content_optimizer.md

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+---
+nav_title: Content Optimizer
+article_title: Content Optimizer
+page_order: 6
+description: "Content Optimizer enables marketers to test and optimize message content at scale, using AI to generate and evaluate high volumes of content variants automatically."
+---
+
+# Content Optimizer
+
+> Content Optimizer enables marketers to test and optimize message content at scale, using AI to generate and evaluate high volumes of content variants automatically.
+
+{% alert important %}
+Content Optimizer is currently in beta and only available for email messages. For help getting started, contact your customer success manager.
+{% endalert %}
+
+## About Content Optimizer
+
+Content Optimizer is a Canvas step that lets you define message components to test, generate variants using Generative AI or manual input, and automatically optimize which content combinations are sent to users. 
+
+- Optimize subject lines, body header, body content, or primary CTA for emails.
+- Continuously improve message performance without manual A/B test setup.
+- Test high volumes of content variants quickly, leveraging AI for ideation.
+- Automatically phase out underperforming content and scale up winners.
+
+## How it works
+
+Content Optimizer uses a non-contextual [multi-armed bandit](https://en.wikipedia.org/wiki/Multi-armed_bandit) algorithm to allocate more sends to high-performing variants and reduce allocation to underperforming ones. Over time, this results in continuous improvement of your message content, with minimal manual intervention.
+
+Content Optimizer is similar to the Message step in Canvas, with features like quiet hours, [Intelligent Timing]({{site.baseurl}}/user_guide/brazeai/intelligence/intelligent_timing), and event logging. You can configure a Content Optimizer step by creating a base message and defining which content components (such as subject line, body text, or call-to-action) to optimize. Variants for each component can be generated with AI or entered manually, and Liquid tags must be added to the base message to map components into the message content.
+
+Each user receives one message per entry into the Content Optimizer step. Re-entries are treated as new, with no memory of previous variants.
+
+### Key concepts
+
+| Term                    | Description |
+|-------------------------|-------------|
+| **Base message**    | The main message template that variants are built from, including all send settings. |
+| **Content components**  | Elements within a message (for example, subject line or primary CTA) that can be tested and optimized. Marketers must insert the relevant Liquid tag into the message where the component should appear. |
+| **Content variants**    | The different values a content component can take. |
+| **Content combinations**| Unique messages created by mixing and matching content variants. |
+| **Send settings**       | All standard message configuration options for the selected channel. |
+{: .reset-td-br-1 .reset-td-br-2 role="presentation" }
+
+## Limitations
+
+- Content Optimizer is currently in beta and only available for email messages.
+- Only one message is sent per user per entry. There is no memory of previous sends for re-entries.
+- Marketers must manually insert Liquid tags for each component in the message composer where the defined content component variants should render.
+
+## Next steps
+
+- Contact your customer success manager to join the beta or for onboarding support.
+- Learn how to create a [Content Optimizer step](placeholder)