A few decades back, to most people an audio book would mean something that was meant solely for the blind, something quite similar to Braille.
There is absolutely no doubt that audio books have aided the visually impaired in a very special way. It has made it possible for them to "read" books without the help of another sighted person.
But today with improved technology and the growing popularity of audio books, they are not just a special means of learning for the disabled, but an interesting idea that has been embraced by a huge number load of people all over the world! The format of audio books has been appreciated by many. It has been seen that it is much easier to comprehend or remember what we hear than what we read. This observation has given audio books a new meaning.