Most of the time, it refers to data transmission over a network. Under Unix, this is the account name of the superuser that can do anything, being able to override all file permissions. This means that they have access to the root account and can perform the tasks that require the freedom that root provides. It should be clear from the context which meaning of root is intended. A computer which performs a particular role for other computers or users.
Most servers actually have multiple roles and provide several services to their networks.
M arkup L anguage formed the basis for HTML , the language of webpages. As the name implies, it is many times more general than HTML and is consequently many times more powerful. A great advantage of SGML's generality is that it can produce document in multiple formats, all from the same source page. The shell is a generic term for anything which passes commands to something else. Typically, it refers to the command-line interpreter which reads your keystrokes and interprets them as instructions for the operating system.