"Signals & Systems" is a comprehensive textbook designed for undergraduate courses in electrical and electronics engineering. This essential guide covers fundamental concepts and techniques of signals and systems that are of critical importance in diverse engineering disciplines such as computer science, information technology, and more. The book lays out a parallel analysis for continuous and discrete-time signals and systems, providing insight into their similarities and differences. The presentation is clear, concise, and engaging with numerous examples to help readers better understand the theoretical concepts. It is the perfect book for students studying for their GATE/IES exams, as it covers all the topics according to their syllabus. The book is also packed with GATE previous papers' solved problems and chapter-wise objective questions at the end of each chapter. "Signals & Systems" is the go-to book for students who want to excel in the field of electrical and electronics engineering.