Unlike consumer APIs (like Gemini for Google Workspace), Vertex AI integrates directly with Google Cloud IAM (Identity and Access Management) and VPC Service Controls.
When you use the Gemini API through Vertex AI, your data is never used to train Google's foundational models. This is the critical distinction between the consumer Google AI Studio and Vertex AI.
Vertex AI allows strict control over data residency, meaning you can ensure your prompts and model processing happen exclusively within specific geographical regions (e.g., `europe-west4`).