A compiler is a computer program that facilitates the translation of source code from one programming language into another. It is essential for the creation of executable programs. Compiler design involves the planning, development, and maintenance of computer languages, including tasks such as runtime organization, syntax verification, output formatting in conjunction with linkers and assemblers, and the generation of optimized object code. This book unfolds the innovative aspects of compiler design which will be crucial for the holistic understanding of the subject matter. Such selected concepts that redefine the discipline have been presented in this book. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.