what is seed 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 8 seeding

php artisan make:seeder UserSeeder

Example 3: laravel 8 seeding

use App\Models\User;

/**
 * Run the database seeders.
 *
 * @return void
 */
public function run()
{
    User::factory()
            ->times(50)
            ->hasPosts(1)
            ->create();
}