I just set up the apache2/mysql server to play around with. But I found the something different than what I saw before. The root directory is pointed to /var/www/html/. I checked the /etc/apache2/apache2.conf file ,and says
<Directory /var/www/> Options Indexes FollowSymLinks AllowOverride None Require all granted </Directory>
This says the root directory points to /var/www/. Is this a bug ? And I also want to know why they made /var/www/html instead of /var/www/.