Explain to me what these are used for?

Http://www.amazon.ca/Close-Macro-Canon-Nikon-Other/dp/B003L1PJK6/

Digital SLR photography is one of my favourite hobbies, and I want to purchase a macro lens, yet I have no experience with lens purchases. I came across these, and found them very cheap. I was wondering exactly what they were used for? I've never encountered those before.

Also, this is a very cheap fisheye lens. I'm very surprised at the price, but I was wondering if this would work well? I'm just guessing here, but this lens attaches to the one you have attached onto the SLR, am I correct?

http://www.amazon.ca/...00488BZAO/

I'm new to lenses, so please try and bear with me.

The first link goes to filters that go on your existing lens. If you get these make sure that you get the proper sized ones for the filter size on the lens you want to use it on. I have a set like this and it does work. This isn't for extreme macro shots though. Here's an example Much of the grain is from this being on a film camera.

The second link does indeed screw onto an existing lens and gives it that fisheye effect. I've never used one, but from what I understand it's not very high quality. I could be wrong though.

The close up will give extreme close up detail of small items like a fly.
the fish eye kinda looks like an oval mounted pic old scHool style.
you can also look into tinted filters they also have cool effects.

These are extreme zooming lenses you can put over the camera lense to get superior zoom without losing quality of zoom from the camera.

The first, closeup filters. A friend likes to call those reading glasses for your lens. It's a cheap way of adding some extra magnification. Get a decent one like the raynox DCR-250 and this can work surprisingly well.

The fisheye… Rubbish really. Yes it does do fish but you get weird distortions, loads of purple fringing and don't even mention sharpness any more. Still… Quite a few young first-time DSLR owners buy them since the need to join the fisheye crowd is so overwhelming.

Good lenses cost good money, great lenses cost an arm and a leg.