There are tons of e-reader out there, but if you aren't searching it's likely you will only know Kindle. Kobo is also very popular, but there're also PocketBook

There are tons of e-reader out there, but if you aren't searching it's likely you will only know Kindle. Kobo is also very popular, but there're also PocketBook, Nook, Likebook, Onyx Boox, Bigme, etc.