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---
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description: |
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Communicators are the mechanism Packer uses to upload files, execute
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scripts, etc. with the machine being created.
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layout: docs
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page_title: Communicators
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sidebar_title: 'Communicators'
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sidebar_current: docs-communicators
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---
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# Communicators
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Communicators are the mechanism Packer uses to upload files, execute scripts,
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etc. with the machine being created.
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Communicators are configured within the
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[builder](/docs/templates/builders.html) section. Packer currently supports
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three kinds of communicators:
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- `none` - No communicator will be used. If this is set, most provisioners
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also can't be used.
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- [ssh](/docs/communicators/ssh.html) - An SSH connection will be established to the machine. This is
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usually the default.
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- [winrm](/docs/communicators/winrm.html) - A WinRM connection will be established.
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In addition to the above, some builders have custom communicators they can use.
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For example, the Docker builder has a "docker" communicator that uses
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`docker exec` and `docker cp` to execute scripts and copy files.
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For more details on how to use each communicator, click the links above to be
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taken to each communicator's page.
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