Root access is administrator-level access in Linux/Unix operating systems. It allows the user to take complete control over all the processes. It is also referred to as the root account. Hence, a root access VPS is the root account in a VPS.
The person with root access is known as the root user or the superuser. He or she has some special privileges and permissions on the system. A root user can execute all the commands and have access to all the files.
The root user can modify the system configuration in any possible way. Moreover, he or she can grant/revoke permission to access certain files or execute some commands. He can even grant other users the privileges and permissions reserved to the root user.
In Linux operating systems, the privileges and permissions are already set by default. This predefined arrangement protects the server from intentional or unintentional damage. But the superuser has the flexibility to change this predefined arrangement as he or she deems more convenient.
The responsibility of the holder of a root access UK VPS is big. He or she must know very well what the consequences of an error are. Giving privileges to the wrong person could result in critical files being erased. That would render the server inoperable.