Does Linux have server roles and service accounts too?
 

I know in the Windows World, servers have roles (IIS, MSSQL) and there are service accounts.

What is the correct way to refer to a server that just runs Apache, a server role too?

And user/groups accounts, like httpd, are those accounts also referred to as service accounts too?

I just want to make sure I'm using the correct terminological.

Yes, Linux also have server roles, you might have seen that during installation. A Linux server running Apache can be referred as web server. During installation (I have seen this on CentOS, Red Hat and SuSE, haven't seen this on Debian or Ubuntu) you will get to choose what role you want the server to play. Refer the following link which is for CentOS 6.5 installation: http://www.tecmint.com/centos-6-5-in...h-screenshots/ scroll down to point number 18 and 19 which shows the screenshot wherein you can choose the server roles (especially point 19 under Servers section on left hand side).

Those accounts are referred as system users. In Windows, system user is a user which has got highest authority and can do whatever it want on the system. Basically in Windows system user has got administrative privileges which is not the case in Linux. In Linux system users are user / groups like httpd, vsftpd, sshd etc.