The basic idea behind Open Source is very simple:

• When programmers can read, redistribute and modify the source code for a piece of software, the software evolves.
• People improve it and adapt it. And this happens at an astonishing pace compared to conventional software development.
• Any change that improves on the original is shared openly and over time the program collects a library of improvements that add value to the software suite – it is often described as "community developed software".
• It is believed the number of individuals inspecting and adding value to Open Source programs improves the quality, security, development speed and adaptability over time.