Split-horizon is a technique to prevent routing loops in distance vector routing protocols. It prevents a router from advertising a route through an interface, which it itself is using to reach a destination. So if you are running rip or igrp or eigrp and router is learning 192.168.10.0 from serial interface. Than it will not advertise this route from this serial interface. It will, hence, prevent routing loop and issues like count to infinity.
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