In production and development, open source is a philosophy, or pragmatic methodology that promotes free redistribution and access to an end product's design and implementation details. Before the phrase open source became widely adopted, developers and producers used a variety of terms for the concept.
Open Source technology makes business sense. Apart from being free and of very high quality, it is often more powerful than most commercially available products. This is because its shared development harnesses the benevolent brilliance of thousands around the world who are continually developing, improving, and evolving its core. It's a worldwide community, getting together to build something awesome, regardless of distance, language, and culture.