The vast majority of web pages are offering information in text and other formats on subjects as diverse as the structure of DNA and how to make a teddy bear.Ebooks come in three categories - free, low cost and what I'm going to call premium (ebooks costing more than a few dollars or pounds).Free ebook are widely used to encourage mailing lists subscriptions. These fee samples are sometimes extracts from larger works and are given away as part of a longer term selling process. On other sites they are just random ebook titles given away to encourage sign up. Often, but not always, they have previously been sold commanding high prices but now are widely available having been on sale for months or sometimes years.

Premium priced ebooks tend to fall into one of two groups. They are either new to the market and as such command a higher price, or the publisher has retained all publication rights and they cannot be sold by anyone other than the publisher and his affiliates. Whilst these publications may be newer they often do not have newer content and can be simply a re-hash of other ebooks.It would be wrong to say that all topics have been fully explored and detailed in ebooks however it is likely that many if not almost all areas of interest are covered by ebooks to some extent. There can be few subjects where ebooks have not ventured to some degree.

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