Some e-books are free,
some can be downloaded for a certain amount of time,
and many require purchase or a login/registration.
Not all e-books are equal; free e-books are not necessarily worth the price (free)!
Remember, unlike library books or classroom texts, e-books are rarely selected for you.
There may be e-books which are poorly written, inaccurate, or inappropriate.
How do you know? Use many of the same techniques you would use to evaluate a web page, such as:
1. Is it appropriate for your ability and for school use? (your iPad belongs to MLTI, not you)
2. Is the information reliable and valid?
3. When in doubt, share your concerns with an adult