This presentation discusses open source software. It provides a brief history of open source including Unix in the 1970s, GNU in 1983, Linux in 1991, and Netscape in 1998. It describes features of open source like copyleft and various open source licenses. The presentation emphasizes that open source code does not guarantee good software - it is the skills of the programmers that determine quality - and contributing to open source benefits both the community and allows individuals to improve their skills.