# FAQ

<details>

<summary>What does 'restrictive' or 'extended' mean?</summary>

See [Restrictive vs Extended](/basic-concepts/restrictive-vs-extended.md).

</details>

<details>

<summary>What is a 'Regional Domain'?</summary>

We offer regional subdomains of MRS in Google Cloud Platform, so that our customers can use MRS in the GCP data center closest to them. This means that they can experience the lowest latency possible. For example, we offer a subdomain in Germany for our customers near Germany, and a subdomain in Singapore for our customers near Singapore.

</details>

<details>

<summary>What is an 'API Key'?</summary>

We will supply you with an API key to authorise your MRS requests, which is a long string of letters and numbers. You send it as a header with every request you make - see [Quick Start](/implementation-guides/quick-start.md).  We strongly recommend you store this securely as we cannot retrieve it for you.

</details>


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