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Most interactive websites nowadays would require a user to log in into the website’s system in order to provide a customized experience for the user. Once the user has logged in, the website will be able to provide a presentation that is tailored to the user’s preferences. Read Developing A Login System With PHP And MySQL tutorial here. (http://www.opensourcetutorials.com/tutorials/Server-Side-Coding/PHP/developing-a-login-system-with-php-and-mysql/page1.html)