"Undefined variable: products

Im getting this error:

"Undefined variable: books (View: C:\xampp\htdocs\Shop\resources\views\welcome.blade.php)"

This is my Model

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
protected $fillable= 
['name','description','condition','category_id','image'];

public function category()
{
    $this->belongsTo(Category::class);
}
}

This is my ProductsController

 namespace App\Http\Controllers;

 use Illuminate\Http\Request;
 use App\Category;
 use App\Product;

class ProductsController extends Controller
{

public function index()
{
    $products=Product::all();
    return view('admin.product.index',compact('products'));
}


public function create()
{
    $categories = Category::pluck('name','id');
    return view ('admin.product.create', compact('categories'));
}


public function store(Request $request)
{
    $product=$request->except('image');
//validation
    $this->validate($request,[
        'name' => 'required',
        'condition' => 'required',
        'image' => 'image|mimes:png,jpg,jpeg|max:10000'

        ]);


//image upload
    $image=$request->image;
    if($image){
        $imageName=$image->getClientOriginalName();
        $image->move('images',$imageName);
        $product['image']=$imageName;

    }

    Product::create($product);
    return redirect()->route('admin.index');
}

This is my Welcome.blade.php

<div class="row">
@forelse( $books as $book)
<div class="column-prod">
<a href="">
<div class="card-prod">
<center><img src="/css/aa.jpg"  style="width: 300px; height: 300px;"></center> </a>
  <div class="container-prod">
    <h2></h2>
    <p class="title"></p>
    <p class="price">Php 450.00</p>

    <p><button class="button"><i class="fas fa-cart-arrow-down"></i>Add to Cart</button></p>
    <p><button class="button"><i class="fas fa-heart"></i>  Add to Wishlist</button></p>
  </div>
  </div>
  </div>

 @empty
 <h3> No Books </h3>
 @endforelse



   </div> <!--Div all end-->
  @endsection

via Chebli Mohamed