This introductory book is intended for students and faculty who are interested to learn about the subject 'Signals and Systems', which is a fundamental topic in the undergraduate curriculum of electrical engineering and its related programs in various universities worldwide. This is typically taught as a second year course, as the concepts covered are the foundation (or pre-requisite) of the advanced courses in the fields of communication, signal processing and control systems. This book is written with a focus on guiding the student on how to solve the numerical problems related to the various concepts presented in this book. For each concept, the relevant theory and several solved examples are presented.