The present textbook on "Open Source Technology" is a sincere attempt by us the make various aspects of Open Source easy and simple to understand. In this respect, we possess all the expertise and experience m the subject matter and appropriately and rightfully feels that "Open Source Technology is a Science as Art". A textbook does not have to be boring, hard to read and nearly impossible to understand. In fact, there are two ways of saying a thing the simple way and the difficult way. The simple way is by no means simpler than the difficult way. Nevertheless, this is exactly what the author has attempted in this book to put the things in the simple way.