Dyslexia is a learning disorder which is characterized by difficulty in reading due to problems with identifying speech sounds and learning to relate letters and words (decoding). Dyslexia is of two types, namely, developmental dyslexia and acquired dyslexia. Developmental dyslexia is used to describe an unanticipated difficulty in reading in children and adults who otherwise possess motivation, intelligence, and schooling considered necessary for accurate and fluent reading. Acquired dyslexia is a result of neurological factors such as traumatic brain injury or stoke. It causes problems with spelling words, reading quickly, writing words, pronouncing words, and understanding the meaning. The rate of attention deficit hyperactivity disorder (ADHD), developmental language disorders, and difficulties with numbers is higher in patients with this disorder. The interaction of genetic and environmental factors results in dyslexia. It can be diagnosed by a series of evaluations that includes examination of memory, spelling, vision, and reading skills. This book includes some of the vital pieces of works being conducted across the world, on various topics related to dyslexia. Its extensive content provides the readers with a thorough understanding of the identification, assessment and treatment of this condition. Researchers and students in this field will be assisted by this book.