> ## Documentation Index
> Fetch the complete documentation index at: https://docs.phala.com/llms.txt
> Use this file to discover all available pages before exploring further.

> Key building blocks of Phala Cloud — CVMs, key management, and GPU TEE.

# Core Concepts Refresher

Before deploying, familiarize yourself with the three core building blocks of Phala Cloud.

<Columns cols={3}>
  <Card img="https://mintcdn.com/phalanetwork-1606097b/57prl00-u-jQKn3n/images/cvm%20(1).jpg?fit=max&auto=format&n=57prl00-u-jQKn3n&q=85&s=23032ca24b2a8608385fdc6c3e6093f6" href="/phala-cloud/cvm/overview" width="2048" height="1200" data-path="images/cvm (1).jpg">
    Confidential VM (CVM)
  </Card>

  <Card img="https://mintcdn.com/phalanetwork-1606097b/5K0xtTfUAWjefI48/images/KMS%20(1).jpg?fit=max&auto=format&n=5K0xtTfUAWjefI48&q=85&s=9a8f454e887cf8c44809d3b9cca0bc1d" href="/dstack/design-documents/key-management-protocol" width="2048" height="1200" data-path="images/KMS (1).jpg">
    Key Management Service (KMS)
  </Card>

  <Card img="https://mintcdn.com/phalanetwork-1606097b/416gZMDMREnPDd33/images/confidential-ai-inference-overview.png?fit=max&auto=format&n=416gZMDMREnPDd33&q=85&s=78dfccdf90de5da01774dd04459c4e79" href="/phala-cloud/confidential-ai/overview" width="2880" height="1616" data-path="images/confidential-ai-inference-overview.png">
    GPU TEE
  </Card>
</Columns>