The book presents a clear and comprehensive introduction to signals and systems and covers the syllabi of undergraduate of almost all Indian Universities. The course content is presented in a sequential order. Analysis of CT and DT signals and systems are done separately. DT following CT immediately. This avoids confusion in the minds of beginners learning this subject when CT and DT are simultaneously presented. To understand various theoretical concepts, variety of numerical examples including those that appeared in recent university examinations have been worked out and persecuted in a graded manner.