Fourier Series is the study of special mathematical technique which helps in representing any function as a summation of sine and cosine series. This type of conversion in sine and cosine series are so special function, its amplitude value are border between (1,-1)! and give you any value from - infinity to +infinity in easy way!; a lot of identities, integrable, differentiable that help engineer and mathematician to solve any problems.Highlights of this textbook: All the necessary chapters are available and interrelated properly. The text style is very simple and lucid. It helps more for independent study. It will assist the instructors to provide very good input to the student community. More number of example sums are offered with a complete explanation. It contains a greater number of exercise problems with the key. Problems used in this text are referred from the past university question papers.