Google searches for exact match + image classification + text search, and also recognizes some famous images (such as Eiffel tower). E.g. if Google sees an unfamiliar image, it converts it to something like a "red swivel chair", and searches for that (so no way it can find the same object unless it is really unique).

I want to make it possible to just snap a picture of anything and find this object. Try to take a picture and search for it on Google Images.

Although, I should say, image search in Baidu works way better than Google's