Computer architecture refers to the rules and methods that explain the implementation, functioning and organization of computer systems. It is concerned with the programming and modeling of computers. The different topics included in this subject are logic design, instruction set architecture design, implementation, microarchitecture design etc. This text is a compilation of chapters that discuss the most vital concepts in the field of computer architecture. Most of the topics introduced in it cover new techniques and the applications of this field. As this field is emerging at a rapid pace, the contents of this textbook will help the readers understand the modern concepts of this subject.