Ping measures the "round-trip time" for messages sent from the origin host to a destination computer that are echoed back to the source.
Latency is the time it takes for a data packet to travel from the source to the destination, usually measured in milliseconds (ms).
Packet loss occurs when one or more packets of data traveling across a computer network fail to reach their destination. High packet loss indicates a poor connection.
Ping may fail if the target server is down, blocking ICMP requests (Firewall), or if there are severe routing issues.
Generally, less than 50ms is excellent, 50-150ms is good, and above 150ms may feel slow in real-time applications.