Virtual Hosts are used to setup more than one domain or websites using a single IP address. This is very useful if anybody wants to run multiple websites using a single IP address on single VPS.

In this tutorial, let me show how to setup virtual hosts in Apache web server on Ubuntu 14.04 LTS. Be mindful that this tutorial is only tested On Ubuntu 14.04 32bit edition. I may not issue any assurance that this will work on all other Ubuntu lower versions and Ubuntu derivatives.

Full article here:
Setup Virtual Hosts In Apache On Ubuntu 14.04 LTS (Unixmen)