Do ebook cost money ?

 Yes, many eBooks do cost money, especially those sold by major retailers like Amazon, Apple Books, or Barnes & Noble. 

However, there are also free eBooks available, either from platforms that offer books in the public domain, such as Project Gutenberg,

 or from authors who provide their work for free or at a reduced cost as part of promotions. 

Some library services also allow you to borrow eBooks for free through apps like Libby or OverDrive.