Multiple subsites in a single wordpress installation

As @AntonChanning said, a multisite installation in WordPress is called a Network. You can easily create a network following the instructions in the codex. You can choose to work with subdomains or with subdirectories, like you want I guess!

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