What does that mean if you are not of the tech world?
Open source means that anyone can find out how it works and contribute to it. Simply put, there is a community of people who contribute to making WordPress hum, and share their methods, with everyone. Equal access means more power at your finger tips. In the tech world, we would call WordPress a Platform. This is nothing more than a fancy name for a software tool that allow you to do a specific job or task.