A Network-attached storage (NAS) device is a file-level computer data storage server connected to a computer network providing data access.
To find out more please refer to the attached link: https://en.wikipedia.org/wiki/Network-attached_storage
The NAS Box will need to be set up by your IT support person.
Infusion can operate on a NAS Box as the Server, but you can not run the software on the NAS Box. You will need to do a full install of the software across a mapped drive to the NAS.
Older and lower performing NAS boxes are not the best, the newer ones should be fine.