This is another “softball” question but you would be surprised by how it trips up candidates. A routed protocol is one that defines the header within a network layer packet and is used at each Layer 3 packet inspection. For example, IP addresses are used to forward packets from device to device in the network.
A routing protocol is one that shares routing information between routers. Routing protocols use messages to exchange routes and network health information. Examples of routing protocols are Routing Information Protocol (RIP), Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), Interior Gateway Routing Protocol (IGRP), and Enhanced Interior Gateway Routing Protocol (EIGRP).