If some packets are lost, you'll notice a slower or inconsistent connection between your computer and the host. Packets that are sent but not received indicate packet loss.For example, if you stopped the ping after sending 15 packets, you'll see '15 packets transmitted,' followed by the number of packets received by the host. Packets transmitted and packets received.
At the bottom of your ping replies, you'll see a section that says '(host or IP) ping statistics.' In Linux, you'll find helpful information in this section, including: