Database connect error

I faced this error while editing the config.php and I don’t know what it is ?
Could not connect to the database. Please refer to suitecrm.log for details (0).
Fatal error : Uncaught Exception: Could not connect to the database. Please refer to suitecrm.log for details (0). in C:\xampp\htdocs\suitecrm\include\utils.php:1978 Stack trace: #0 C:\xampp\htdocs\suitecrm\include\database\MysqliManager.php(327): sugar_die(‘Could not conne…’) #1 C:\xampp\htdocs\suitecrm\include\database\DBManagerFactory.php(150): MysqliManager->connect(Array, true) #2 C:\xampp\htdocs\suitecrm\include\entryPoint.php(186): DBManagerFactory::getInstance() #3 C:\xampp\htdocs\suitecrm\index.php(47): require_once(‘C:\xampp\htdocs…’) #4 {main} thrown in C:\xampp\htdocs\suitecrm\include\utils.php on line 1978