Textbook in PDF format Fractional differential equations (FDEs), owing to their modeling potential in different branches of science and engineering, are attracting the attention of researchers. The concept of a fractional derivative is an extension of the classical derivative to a non-integer order derivative. Various types of fractional derivatives have been introduced, each being a generalization of an earlier version or having a certain advantage in a particular application. The present book consists of seven chapters selected to represent some of the current research trends in the area of fractional differential equations