What is the `rewrite_rules` option the options table in the WordPress database?

I found some documentation here. It looks like this is accessed when saving the permalink settings under Settings->Permalinks. It looks like this works in conjunction with the rules stored in .htaccess.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)