ARP Frame
The lower layers in the protocol configuration encapsulate data frames. The frame header includes the MAC header and the IP header, followed by the ARP message.
The device that discovers its own IP address in the IP header reads the rest of the packet and returns an ARP reply. The rest of the devices on the segment discard the packet.
The ARP reply contains the MAC address of the destination computer which is the information being sought.
When the computer that sent the ARP request receives the ARP reply from the destination computer, it has the information it requires to properly address the data packet.