ICMP

ICMP (Internet Control Message Protocol) is a communication tool used by devices on the internet to send error messages and operational information. When data packets travel between computers, ICMP helps identify issues like unreachable destinations or network congestion. For example, if a website is down or a router encounters a problem, ICMP messages inform the sender. It's a vital part of maintaining smooth and efficient network operations, helping identify and troubleshoot connectivity issues without interfering with the actual data being transmitted.