That depends on the platforms you publish through.
If you use Amazon KDP, your book can be sold on:
- Amazon websites worldwide (US, UK, India, Canada, etc.)
- Kindle Store for ebooks
- Amazon Print for paperbacks
If you use IngramSpark, your book can appear in:
- Online bookstores (Amazon, Barnes & Noble, Book Depository)
- Physical bookstores (if they choose to stock it)
- Libraries and academic retailers
Your choice of platform directly affects how widely your book can be distributed.