The article "Ensuring website safety" is provided by Sophos Plc and SophosLabs.
Dedicated servers are reserved for one user. This form of hosting has two subtypes: managed and unmanaged.
Managed servers are monitored by the staff responsible for local security issues and troubleshooting.
Unmanaged servers are usually not monitored, which allows to cut down expenses to some extent. All services are paid additionally.
Virtual dedicated hosting is the most effective of the listed options. It is usually cheaper than dedicated hosting, but provides the same level of flexibility and security.