Books are written texts that can be published in several forms: printed on paper, as a recording (on physical media or as a digital file), or online as a digital file like a PDF or an ePub book. In some cases, an searchable online database can also be the equivalent of something like a 'Reference Book'.
Different types of books fulfill different needs. Books can offer authoritative facts (Reference Books), a scholarly deep-dive (Monographs), or knowledge and entertainment that you don't have to be an expert to understand (leisure reading such as classic and contemporary fiction). All those types of books are available to us, as you'll see below.
*Not really joking either, since the cooperative interlibrary loan system used by libraries makes it possible to request and borrow many print books located in other libraries around the world.
'Folios' are books so big, they won't fit on the regular book shelving. That's it; that's all that word means - over-sized books.(Think: those large 'coffee table books' that some people like to display at home.)
Okay; maybe that's over-doing it a bit...
If a book you looked up has the word Folio in the call number... you won't find it by looking through the regular book shelves - you'll have to go to the Ground (G) level (aka: the basement), then to the last few book shelving units (the ones closest to the elevator end of the floor) - and locate folio books there, where they're filed by call number.
