What is automated deployment?

So far, most of the time we have only been dealing with the development mode of Next.js. But real-life projects have to be deployed on production servers at some point. And, of course, no sane person wants to deploy a product that has issues that will affect customers. After all, the main purpose of a product is to make customers happier. In order to make sure the quality of the product meets certain standards, the bare minimum is manual testing. This is when you or your QA colleague simply use the product and try to find all possible issues. Unfortunately, this is very time consuming and very ineffective as the project grows larger. Moreover, it is absolutely not guaranteed that any change in the system will not affect other parts of the system, so the only way to ensure quality is to test the entire system on every single change, which is completely...