Views are the way Gaby communicates with you (and vice-versa). This means that you enter data in a view and you read it back from a view (possibly different than the one you entered data in).
Since your data can be represented in several different ways there are several different views, each useful (hum hum) and dedicated to a particular task (forms are more appropriate to enter data than lists that are more appropriate to show lots of records at the same time, ...).