MySQL has a sophisticated multiuser access-control system that can allow or prevent each user from having access to a particular database or individual tables. You can even restrict the types of operations the user is able to perform on a table.
When MySQL is used as the back end to a website, you will usually have only a single user account through which all the connections from the web scripts are performed. Your application will handle any additional user authentication that is required in the web browser.
When you connect to a MySQL server, you provide a username and password ...