Instead of being printed on paper, the information is uploaded online to the publisher's website. Students can go to the website and log in to read it wherever and whenever they need it. Furthermore, the e-book is sold online at a lower price than the printed book and students can purchase it at any time. Without printing documents, not only can the company save billions of dollars, but also the students. Another key point: e-books have no weight. University students, who have smartphones, can read directly on their cell phones; others, who don't have smartphones or laptops, can go to the campus library or computer lab to read the online version of the book. Students don't have to carry heavy printed books around campus as long as their device can connect to the Internet, so they can read them easily and effectively. Furthermore, the e-book format provides some useful tools such as highlighter, translator and facilitator that users can use to add, remove or take notes