SSL utilizes several standard network security techniques including public keys, symmetric keys, and certificates. Web sites commonly use SSL to guard private information such as credit card numbers.
CONFIGURATION Instead of using a point-and-click graphic user interface (GUI) or Windows Registry keys as most other modern software packages, Apache generally relies on simple text files for its configuration settings.
Configuring Files Apache uses a system of three text files for managing its configuration data. All three of these files (almost always) appear in Apache's ./conf directory and are designed to be edited by system administrators:
This file contains a number of other entries (technically called directives), but for most of these, modifications are optional.
The most useful of these entries is ServerAdmin -- it allows the administrator to set the email address that will be displayed on error pages (such a "404 pages") in the client's browser, giving users a way to contact someone if a site problem occurs: