[smirt362]

Your ping refers to how long it takes for a message from the server to reach your computer and back again. Mines so low because the server is basically an hour away from where I live.

In your example, it takes about 1 second for a message to get to Danne4Life's computer and back to the server. So the data about where he is currently and all that isn't instantaneous. It's why he jumps around a lot.

Ping is a measure of latency or drag in the spread of information in a system, in this case between the player's computer and the game server. It's basically a measure of how laggy you are.