##What does this mean? Your web application - out there on the Internets for all to see! We are leaving your local development environment and heading into staging and production.
We develop our apps in many different "environments" and so far we have discussed and worked with our test environment and development environment.
To follow Agile Development Methodologies we aim to build out some functionality through testing locally, then do a release (i.e. deploy the app) and test it out in production. Once it's up we check to make sure it's running the way we expect - through QA-ing (quality assurance testing). In this stage we may also get feedback from clients or other teams. Next, we make changes and updates to those features, re-releasing the next iteration to test. Then, once those features are finished, we begin with the next set of functionality.