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Latency is the amount of time that it takes for information from your computer to travel to the source. Latency should not be confused with bandwidth, as bandwidth measures how much data you can move in a given period of time, but not necessarily how fast it moves. For example, if I am connected to a computer in the next country, latency measures how long it takes for each letter that I type to travel to the other computer. Latency is important when someone is directly interacting with another computer, as the amount of "lag" between the two computers can make some tasks very difficult (such as editing a file). Bandwidth, on the other hand, is not concerned with latency. When downloading a large file, it may be perfectly acceptable to have a 3-4 second wait before the file begins to download.

Networking latency is the time it takes for a single packet to go from your computer, to another host and back. Latency is generally measured in milliseconds. You can check the latency (also referred to as lag) by opening a command prompt and typing "ping "

Example: ping www.Google.com

Latency varies based on many factors, such as physical distance to the host, network congestion, and quality of the connection. In a LAN environment latency to another LAN host is generally < 1ms

Over the internet, via a good Internet connection, 30 - 80ms is typical to a server located in the same country (at least in the United States). Lower latency is always better.

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Q: What does latency mean?
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