A programming language is a set of instructions that are used to develop programs that use algorithms. Some common examples are Java, C, C++, COBOL, etc. The description of a programming language can be divided into syntax and semantics. The description of data and processes in a language occurs through certain primitive building blocks, which are defined by syntactic and semantic rules. The development of a programming language occurs through the construction of artifacts, chief among which is language specification and implementation. This book elucidates the concepts and innovative models around prospective developments with respect to programming languages. Most of the topics introduced in this book cover the principles and practices of developing programming languages. The textbook is appropriate for those seeking detailed information in this area.