What is the meaning of collie?
The collie is a type of dog used for herding. You may have heard of sheepdogs before.
wow, i haven't heard about sheepdogs, tell me about it
Collies are medium sized dogs. They are light in build and they have a pointed nose. They are very trainable and smart dogs.
wow, i see, so where can i find one for purchase?
They are actually very common and collie breeds have spread to many parts of the world. There are many in North America and they have many varieties. Many breeders would have this kind of dog. 
Wouldnt i find one in europe?
You might be able to, there is a certain breed called a border collie which is found in Great Britain. I think that's a popular dog there.