Open source movement is an initiative, by individuals around the world, aimed at providing robust software for free (through open source). The software is developed through collaboration among people through open source codes (that are available to anyone). Some common examples of open source software are Linux, open office, Mozilla Firefox, Apache, etc.
The open source movement traces its history to the development of the GNU Project on the East Coast and BSDUnix at UC Berkeley in the 1970s and 1980s. Around 1991-92 the first Linux Kernel was implemented by a Finnish engineer, Linus Torvalds. These developments resulted in stable software and widespread public interest in the open source movement. The term Open Source was coined in a strategy session held on Feb 3, 1998 in Palo Alto, California. In the same month, Open Source Initiative (OSI) was founded as an educational, advocacy and stewardship organization.