All of our eBooks are provided in EPUB format - the format used by all major eBook readers.
When you purchase an eBook from our website you will find a download link on the order confirmation page and you will also receive an email with the download link.
If you make the eBook purchase on the device you will use for reading the eBook then you can click the link on the order confirmation page to save and open it.
If you need to open the eBook on a different device than the one you used to purchase the eBook then you can open the email on the device you will use for reading eBooks and then click to download and install the eBook.