Open source is an approach to design, development, and distribution offering practical accessibility to a product's source (goods and knowledge). Some consider open source as one of various possible design approaches, while others consider it a critical strategic element of their operations.
As a sysadmin, open source software can rid you of many hassles of closed source software:
- No vendor lock-in - you can always take your product and hire others to continue work on it
- Often free-of-charge - also said to be "free as in beer"
- Security - often reviewed by many developers and large companies
- Stability - also because of extensive review