If you wanted to read a book in the old days, you had to buy a paper copy and lug it around with you wherever you went. If you wanted to read two or more books, you had to carry two or more books. That meant carrying around a lot of bulk and weight just on the off chance you would actually have time to do any reading.
Nowadays, you can load and carry thousands of books of all kinds as e-books. An e-book takes up a minimal amount of space and you can read it on your Mac whenever you want. If you have a laptop, you can read e-books while traveling.
The following are the most common e-book file ...
