Answer Description
The Internet Control Message Protocol (ICMP) is used to control IP networks. It is used for error reporting, network congestion, and availability.
Wikipedia
The Internet Control Message Protocol (ICMP) is a supporting protocol in the Internet protocol suite It is used by network devices, including routers, to send error messages and operational information indicating success or failure when communicating with another IP address, for example, an error is indicated when a requested service is not available or that a host or router could not be reached ICMP differs from transport protocols such as TCP and UDP in that it is not typically used to exchange data between systems, nor is it regularly employed by end-user network applications (with the exception of some diagnostic tools like ping and traceroute)
Internet_Control_Message_Protocol - Wikipedia, the free encyclopedia