Apache has a number of block directives
that limit the application of other directives within them to
operations on particular virtual hosts, directories, or files. These
are extremely important to the operation of a real web site because
within these blocks — particularly
<VirtualHost> — the webmaster can, in
effect, set up a large number of individual servers run by a single
invocation of Apache. This will make more sense when you get to the Section 4.1.
The syntax of the block directives is detailed next.