The environment is the runtime environment in which a task is executed.
There are 2 environments you can use in Swarm, i.e. Test and Production. These environments are distinct and do not affect each other. You can use the Test environment to test a workflow before releasing it to the Production. It is very useful when you make changes to a workflow and want to test before deploying them to your production system.
Learn more about creating a release in Test and Production environments here
You can also set your workflow to use different information (such as passwords or API keys) when running in the Test and Production environments by using Environment variables.
Learn more about Environment variables here