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The ping tool is a network utility used to test the connectivity and measure the response time between two devices on a network. It sends a small packet of data (ICMP packet) to the target device and waits for a response.
If the target device receives the packet, it will respond with an ICMP echo reply message, which the ping tool will then display as output. The tool measures the round-trip time between the sending of the packet and the receipt of the reply, which is commonly referred to as the "ping time" or "latency".
Ping can be used to test the reachability of a device on a network, diagnose network connectivity issues, and determine the quality of network connections. Ping can also be used to measure the speed of a network connection by sending multiple pings and calculating the average response time.