Difference between nikon and canon

I want to buy a camera but i'm not sure which one to choose, even because i don't know the difference!

There's none, nor between Pentax and Sony - for DSLRs, you just pick the one that feels right in your hands.

For bridge cameras, Fujifilm's inclusion of a viewfinder and manual controls on even their cheapest models makes them hard to beat.

For cheap P&S as long as you avoid Kodak, Benq, Vivitar and GE, you won't go far wrong, but Canon and Nikon charge more money for less camera.

No serious photographer looks twice at EVIL cameras.

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No real difference, just pick which ever you get on with best! Do some research of the Nikon and the Canon body that you would be interested in (and the lens choices of course). Maybe ask to have a look at them in the shop. Get to know them a bit and choose your favourite.

Personally i prefer Nikon (Haven't owned a Canon, only used my friends) so it could be that i'm just used to Nikon more, but every one is different.

The main difference between these are the lens mount: current Nikon DSLRs accept only Nikon/Nikkor AF, while current Canons use the Canon EF mount. The two lines of lenses are not interchangeable, although there are third-party companies that make lenses for both mounts. Typically, once you start buying equipment for one brand, it is less expensive to stick with that brand from then on. Same goes for other major camera companies like Sony (Alpha A-mount), Olympus (Four Thirds system), Pentax (K mount).

Less significant are the various menus, and the jargon that goes with it (such as S mode vs Tv mode that both apply to shutter speed, VR and IS which both stabilize the lens, etc.).

One notable difference at the entry-level end is that Nikon bodies don't have autofocus motors, and rely on the lens to do so. Some lenses do very poorly in certain lighting situations.

Many of the other differences will be very minor and esoteric compared to the initial challenge of operating a DSLR.

If by chance you were talking about compact (P&S) or mirrorless/EVIL cameras, a lot of these are functionally similar. It is easier to divide those by price range than by feature set.