what is route group mean in laravel code example

Example 1: laravel Route::group definition

Route::group(['prefix'=>'accounts','as'=>'account.'], function(){
    Route::get('/', 'AccountController@index')->name('index');
    Route::get('connect', 'AccountController@connect')->name('connect');
});

Route::group(['prefix'=>'quotes','as'=>'quote.'], function(){
    Route::get('/', 'QuoteController@index')->name('index');
    Route::get('connect', 'QuoteController@create')->name('create');
});

Example 2: route group in laravel

Route::group(['prefix' => 'admin']){
	Route::get('/',function(){
    	//...
    });
}