What is the equivalent for 'www-data' for CentOs?

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http://unix.stackexchange.com – CentOs doesn't recognise www-data but want to change ownership on my files folder. All my folders are owned by root at the moment. Confused as to what should be owned by apache and what she be owned by me the root user? Also when it says root root does that mean root user me and group apache root? (HowTos)