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ARP can help you to document the network by providing the list of MAC Address (which is universally unique Hard coded Physical Address) on the network.
ARP protocol could help administrator to get the list of computers MAC adresses with their relatives IP addresses. Knowing that MAC adresses are unique for every equipement connected to the network, administrator can dress a correlation table for users.
It's a broadcast sent AT LAYER2 in order to figure out who has a Layer3 IP address.
Definition: ARP converts an IP to its corresponding physical network address. ARP is a low-level network protocol, operating at Layer2 of the OSI Model
and we use ARP in to know also which name for that ip for ex.
on command prompt;
ping -a192.168.1.x
it will gives you the name for that IP, and i will get data fron DNS Server