“Staging site”, “development site” and “deployment environment”. These are all different terms referencing the same thing.
So, what is it?
In the simplest of terms, a staging environment is a clone of your website. This allows you and/or your web developers to make and test changes before implementing those changes on your live website. Whether a security update or a new feature, making changes on the clone protects you from a broken, buggy website. Once you know the change works, the new code can be quickly pushed to your live site. If you have a website, especially if you have a website that represents a business, we cannot recommend a staging environment enough.