what is seeder in laravel code example

Example 1: laravel run seed

#All of them
php artisan db:seed
#One class
php artisan db:seed --class=UserSeeder

Example 2: laravel make seeder

php artisan make:seeder NameOfTheSeeder

Example 3: make seeder laravel

php artisan make:seeder UserSeeder

Example 4: laravel run seeder

php artisan migrate:fresh --seed

Example 5: laravel 8 seeding

/**
 * Run the database seeders.
 *
 * @return void
 */
public function run()
{
    $this->call([
        UserSeeder::class,
        PostSeeder::class,
        CommentSeeder::class,
    ]);
}