While frontend always deals with the visual aspect of stuff, backend can mean different things to different people. For some cases, backend is simply to load a

While frontend always deals with the visual aspect of stuff, backend can mean different things to different people. For some cases, backend is simply to load an object from a DB, convert to JSON and send it the client. But backend can also mean "provide a list of movie recommendations against what user has already seen and convert that list to JSON".