The creation of the fundamental structures of a software system is referred to as software architecture. The architecture of a software system functions as a blueprint for the system and the developing project. It details the tasks necessary to be executed during the designing. There are four core activities in software architecture design that are performed iteratively at different stages of the initial software development life cycle. These activities include architectural analysis, architectural synthesis, architectural evaluation and architectural evolution. Some common components of software architecture are software architecture description, architecture description languages, architecture viewpoints, architecture frameworks and software architecture erosion. This book contains some path-breaking studies in the field of software architecture. It traces the progress of this field and highlights some of its key concepts and applications. The extensive content of this textbook provides the readers with a thorough understanding of the subject.