A hop may refer to any of the following:
1. When referring to a network, hops are the amount of connections in-between the source and destination. With the traceroute command, any user can see how many hops it takes to reach a destination. As can be seen in the example below, to connect from an example computer to Computer Hope it took three hops; traceroute displayed each of the servers, routers, and their response time for each hop.
1 169 ms 190 ms 160 ms slc1-tc.xmission.com [188.8.131.52]
2 159 ms 160 ms 190 ms cisco0-tc.xmission.com [184.108.40.206]
3 165 ms 189 ms 159 ms www.computerhope.com [220.127.116.11]
2. In IRC, a HOP is short for Half OP and is a user that doesn't have every right, but can kick, ban, voice, and change topic.