The Holga is called a toy camera because its made of all plastic. Yes even the lens is plastic! There really isn't any way to focus it and when you are looking through the view finder you're not even looking through the lens. Now while I'm kind of making the Holga sound like a horrible camera, it really isn't at all. It's full of chance and serendipity, because it's likely to have light leaks you never know what you're going to get on your roll of film. It's this cheap camera that can produce really detailed images.
I've been really interested in the different types of Holgas lately and came across a Holga 120 Twin Lens Reflex. It looks really neat but it's around $60 and needs special films. Maybe it'll be going on my Christmas list... haha.