Refactoring means re-architecting your applications so that your application is compatible with the new (cloud) platform or technologies and can run on the new (cloud) infrastructure with maximum efficiency. It may involve making code changes while ensuring that the external behavior of your application remains the same. For example, if you plan to move to a cloud platform and your application utilizes a lot of resources, it may increase your cloud billing. In most cases redesigning your application for optimal resource utilization is required before migrating to the cloud. Refactoring is done so that you can have maximum leverage of the benefits of the new (cloud-native) environment.