How is Calzone different from a Stromboli?

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i donno much about it but i wanna know that what's the difference. i think calzones dont have sauce in them but sometimes have sauce on top of them. the main ingredient is ricotta cheese, parmesan and mozerella and lots of it. i suppose. whereas a Stromboli, as far as i know about it, is named after a volcano, is cut open so that the stuffing spills and melt over like a lava. the calzone seems more like a turnover and the stromboli, for lack of a better description , seems more like a larger version of a hot pocket. whatever, i donno much about stromboli, i know a little about them. what all do you people think .