When you have root-level access to a server, it indicates that you will have full control over it. In other words, you can set up any server-side application whatever the changes that it will make to the software environment on the server, and you are able to both access and change any kind of file, which includes system files, and change various settings. You can do this by connecting to the server as a root user which has full privileges to do all these things as well as to make other users, including users who also have full privileges. This connection can be established using a web-based graphical interface or a Secure Shell console. For security reasons, it's recommended that you make one more user for your everyday work and employ the root user only when you need to customize the server or to install software which may be required by some script-driven application that you'd like to run.