What is the practical difference between is_admin() and is_blog_admin()?

On a multisite network is_admin() is true for everything under /wp-admin, including the multisite network admin at /wp-admin/network, but is_blog_admin() is only true for the admin for an individual site/blog on the network, and is not true for /wp-admin/network.

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