what the hell is model and why controller returns random string?

hey guys. can smb explain what the hell model is? bc i tried googling and its just vaguely said that model is your data. yes, i know its from MVC pattern, but it still doesnt make any sense, can smb explain what the f is going on here:
@GetMapping("/importBgwEod")
    public String importBgwEod(Model model) throws JAXBException, IOException {
        importService.importBgwEod(getUserId());
        model.addAttribute("status", "Success!!!");
        return "status";
    }

how can importBgwEod accept model argument, but its not requeired for the GET request? why this method is returning random string status? where do i get this needed model from? thx
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