Can this tool be used to open cans? Target has a tool called can opener. 



Can it be used for opening vegetable cans, tuna cans, ..., which don't have pulls on their tops?

How can it be used?

I asked because I only used a can opener that looks different to the one above, and looks like this one.
Those two versions of a can opener operate on exactly the same principle. The difference is that the simpler one has a cutting "blade" that's basically just a part of the main body that's been bent at right angles and maybe sharpened a little bit, while the nicer one has an actual separate circular blade.1 Both will serve the purpose of opening cans, but the simpler one will probably need more physical effort expended.

1I think - it's actually hard to tell, given that the picture is from the least useful angle imaginable.