“Computer Fundamentals, Organizations and Architecture” this book is written for readers in fields like computer engineering, technological and others. This book covers topics like Fundamentals of Computers, Block Diagrams of Computers and their Functions, Concepts of Hardware, Software and Firmware, Computer memory and its types, Fundamentals of Digital Electronics, Complements of Fundamentals of Digital Electronics, Processor and control units and many more.There are two main stances on computers that are covered throughout the book. Two perspectives on computers exist the computer’s wider structure and purpose and the programmer’s. The first perspective discusses topics typically covered in an introductory computer science course, such as assembly language and computer organization, whereas the second discusses topics typically covered in an advanced computer science course. By doing so, we want to provide professors, students, and working engineers/scientists with enough knowledge to choose the best chapter(s) to cover in class or study before an exam.