Variables in a DeployHQ project are dynamic elements based on various aspects of a deployment that can be used specifically in Config files, SSH commands and in most cases, notifications. You'll find a full list of these variables by clicking the link below your main configuration box when you're configuring either feature.

A useful example is the %environment% variable that can be added in your server's settings when you're configuring it. You might add the %environment% variable several times in a config file to match some preconfigured environment variables on the end server, such as ENV['%environment%'].