Re: I am trying to buy a book through my iPad but I get an indication that it is a kindle activity.
Welcome to iMore,
We need more information than what you've given. How are you trying to purchase the app? From where/what site? Are you using an app on your iPad to purchase the book? If so, what app.. the App Store app, the Amazon app... what app?
Re: I am trying to buy a book through my iPad but I get an indication that it is a kindle activity.
Yes you can, in iBooks quite simply, or download the Kindle app and the Kindle store as a bookmarked webpage and buy from Amazon (which will probably give you cheaper books)
You do not mention wether you are trying to purchase an actual physical book or an ebook ?