In todays book publishing market, publishers come in a number of sizes to include self publishing companies that can help you actually become one of the many, proud book publishers. Some book publishers actually specialize in certain genres of book. For example, non-fiction, historical, childrens books, text books, etc. Through specializing, this gives many book publishers an easier time to reject pieces of work that have been submitted. They can can clarify to the submitters more easily that they do specialize. Self publishing companies are popping up all over. Typically a self publishing company does not specialize, they are available to help you get your work published. They offer a variety of choices for self publishing. For example, you can choose to have your books published in hard back, paper back or how about simply going completely green and only offer electronic publications to your potential readers. There are now quite a few electronic book readers available such as; the Kindle, Alex e-reader, Pan Digital novel, and many others. Not sure how the electronic readers work? Its actually quite simple, a person purchases one of the electronic readers, they can then go online and search for electronic books, they then purchase one and it is downloaded onto their electronic readers. Many of the readers can store several hundred books. There are also some that have a flash drive attachment so that more books can be stored.