The Apache Commons IO are the components of the Apache Commons which are derived from Java API and provides various utility classes for common operations for File IO covering a wide range of use cases. It helps avoid writing boilerplate code. This book covers most of the topics required for a basic understanding of Apache Commons IO and to get a feel of how it works. This book has been prepared for beginners to help them understand the basic to advanced concepts related to Apache Commons IO. Before you start practising various types of examples given in this reference, we assume that you are already aware of computer programs and computer programming languages.