aaP_erikator
It's a swap file that provides virtual memory space. When physical RAM gets full, the system uses this space as additional memory (it depends on the how high the swappiness is), and having 1GB of swap space is a common configuration.
If you want to delete it, first you need to see the current swap usage (not recommend to delete if it's used):
then you can properly remove it through terminal / ssh:
sudo swapoff /root/www/swap
sudo rm /root/www/swap
