Best way to drag and drop an images?

So I am not sure how to go about this but I am trying to make an area where you can drag and drop png images. So for example there might be a baseball. a baseball bat and a baseball glove. I want to be able to touch and hold and drag the item around and then release and have it stay wherever I put it. I am having a hard time figuring out how I would do this even in HTML. Any ideas?