What is NAS?

NAS (Network Attached Storage) is simply a device connected to the network and capable of storing data, so it is also called "network storage". 

It is a dedicated data storage server. It takes data as the center, completely separates storage devices and servers, and centrally manages data, thereby releasing bandwidth, improving performance, reducing total cost of ownership, and protecting investment. 

Its cost is much lower than using server storage, but its efficiency is much higher than the latter.