Security monitoring.
Installing, compiling the standard server applications
Maintaining the standard server applications
Latest security updates, patches
these are generally and included but ofcourse not restricted to above.
These days there are multiple ways to manage your semi dedicated server package or a dedicated server hosting package. As there on sever or off server involved is you are getting or managing the server load for the website. As those script can mange your server load or you can also go with the load balancing server too