'What means '@internal' in aws-sdk-js code

I read the aws-sdk-js/cloudsearch code.

Some variable has '@internal' annotation.

-- like below

/**

  • Unique service identifier.
  • @internal */ serviceId?: string;

--

what means?

[code]https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-cloudsearch-domain/src/CloudSearchDomainClient.ts



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