PING sends a special packet designed to get a response back from a particular remote node. It's usually possible to send several or even continuous PINGs in succession, and the latency of each PING is commonly displayed. "-n 10" is used to send 10 PINGs:

c:\>ping -n 10 www.TechTV.com
Pinging www.TechTV.com [64.95.116.134] with 32 bytes of data:
Reply from 64.95.116.134: bytes=32 time=26 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=23 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=22 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=22 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=23 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=22 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=24 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=25 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=26 ms TTL=47
Reply from 64.95.116.134: bytes=32 time=22 ms TTL=47
PING statistics for 64.95.116.134:
Packets: Sent = 10, Received = 10, Lost = 0 (0 percent loss),
Approximate round-trip times in milliseconds:
Minimum = 22 ms, Maximum = 26 ms, Average = 23 ms