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Environment variables are variables that are scoped to an environment, such as local development or production. They are useful for storing variables that can be re-used across the collection that are different depending on the environment. An example would be the host url of the server you want to test.

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Creating an Environment Variable

  1. Go to environments (top right) and press No environment.
  2. If there are no environments, you will be prompted to create one.
No-Environment
  1. Add your variable name and value for the specific environment.
  2. Save your changes.
No-Environment

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Using an Environment Variable

Just like other variables you can use the {{varName}} syntax to use an environment variable in a request. On the top-right, you can see which environment you are currently using and select a different one. Environment Variables location

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Using the ./environment directory

Environment variables are synced with the /environments directory inside your collection. You can also create and manage environments there. Each environment is saved in a <environment-name>.bru file, which looks like this: 
vars {
  host: http://localhost:8787
}
For information on importing and exporting environment variables, see the Import/Export Environments guide.