Real anchovy or sardelle is not to be mixed up with tinned anchovy. Tinned anchovy contains of sprats, small herrings.
The sardelle is a pickled and salted real anchovy. Sardelle is also, like the sprat, a small herring which you can find in western and southern Europe, mainly in the Mediterranean sea and the Atlantic.
The sardelle is often used in the Italian kitchen because of its salty taste.