Undefined variable: sdays (View: D:\Xampp\htdocs\sunday\resources\views\welcome.blade.php)......what is the problem in my code

  @foreach($sdays as $sdays) 
    <tr>
        <td>{{$product->id}}</td>
        <td>{{$product->name}}</td>
        <td>{{$product->email}}</td>
        <td>{{$product->department}}</td>
        <td>{{$product->DOB}}</td>
        <td>{{$product->password}}</td>
        <td>
    </tr>
    @endforeach

I just want to show data from database but it's does not work

this is controller file

public function index($Sdays,$sdays)
{
   $sdays=Sdays::get();
         return view('registation', compact('welcome'));
}