FreeBSD - Definition from the Hotspot Shield Glossary
This is an operating system that is based on the UNIX platform and has been extensively developed by a large open community. FreeBSD claims to have advanced networking functionality, security, great compatibility with a wide variety of programs and applications, can be configured as an intranet server.
As there are a large amount of developers contributing to FreeBSD its features and usability are continually improving and it has an extremely large scope. Specific features of FreeBSD include USB support, Accounting API, TCP/IP network support, Linux emulation and firewall support. While not as widely used as the other major operating systems such as Windows and Mac OS, FreeBSD does have a large following and a tight-knit community who care about its progression and development.