Whilst you could buy an ebook on a CD, DVD or even pre-installed on a memory stick; by far the majority of them are downloadable ebooks from websites. Of all the downloadable ebooks a good proportion of them will be ebook free downloads; that are used as a marketing tool to encourage you to buy something else. Not exclusively so but a common format for ebooks is the ebook pdf, making them readable by anyone who has Adobe Acrobat Reader installed on their computer or PDA.
Whilst books in an ink and paper format will undoubtedly go on for a long time to come; it was inevitable that after so many centuries of dominance another format would come along to challenge it. So it is that in the modern age that ebooks are starting to challenge the old format. With so many people owning computers and PDAs it’s simply becoming easier to get downloadable ebooks in the ebook pdf format to read and consult. The use of the term consult is important here as; it is the combination of having an ebooks free download that you can consult so easily - that makes them so attractive.
You can read any conventional book; refer to it, cross reference it, compare what it says to other publications etc. The massive advantage of an ebook pdf is that not only can you read it but - with a minimum of effort (if any) be surfing the internet making comparisons to what you’ve just read and what other ebooks say about it. Having hyperlinks in ebook pdfs makes searching and cross-referencing within them fast and simple; whilst being on an internet enabled computer you can easily access other downloadable ebooks on the same subject. In other words when reading a technical or marketing ebook - you can compare what it says to any other e-publication available over the internet.