A hop may refer to any of the following:
1. When referring to a network, a hop is an intermediate connection between the source and destination. With the traceroute command, any user can see how many hops it takes to reach a destination.
1 169 ms 190 ms 160 ms slc1-tc.xmission.com [126.96.36.199]
2 159 ms 160 ms 190 ms cisco0-tc.xmission.com [188.8.131.52]
3 165 ms 189 ms 159 ms www.computerhope.com [184.108.40.206]
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.