What is Eloquent? in php code example

Example 1: laravel scope query

$model = App\Models\Flight::where('legs', '>', 100)
            ->firstOr(['id', 'legs'], function () {
                // ...
            });

Example 2: what is actullay work model in laravel

/**
 * The attributes that aren't mass assignable.
 *
 * @var array
 */
protected $guarded = [];