The term Virtual Host refers to the practice of running more than one web site (such as company1.example.com and company2.example.com) on a single machine. Virtual hosts can be "IP-based", meaning that you have a different IP address for every web site, or "name-based", meaning that you have multiple names running on each IP address. The fact that they are running on the same physical server is not apparent to the end user.
Apache was one of the first servers to support IP-based virtual hosts right out of the box. Versions 1.1 and later of Apache support both IP-based and name-based virtual hosts (vhosts). The latter variant of virtual hosts is sometimes also called host-based or non-IP virtual hosts.
Below is a list of documentation pages which explain all details of virtual host support in Apache HTTP Server:
Virtual Host Support
- Name-based Virtual Hosts (More than one web site per IP address)
- IP-based Virtual Hosts (An IP address for each web site)
- Virtual Host examples for common setups
- File Descriptor Limits (or, Too many log files)
- Dynamically Configured Mass Virtual Hosting
- In-Depth Discussion of Virtual Host Matching
More : apache.org
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