Looking for a book does not need to be stressful and complicated.
Kindle is no doubt the most successful line of electronic readers today. In 2019 alone, it has an estimated 75% market share in the US and 95% in the UK. That’s high.
It is no surprise as the Amazon Kindle is portable. There is no need to carry your thick books on the train, in the school, office, or wherever you go. It is extremely convenient.