Example Concept: GRE tunnels provide a simple way to encapsulate packets from various network protocols over an IP network, enabling the creation of virtual point-to-point links. They are particularly useful for connecting different network segments across the internet, supporting multicast traffic, and enabling dynamic routing protocols like OSPF or EIGRP over the tunnel. However, GRE itself does not provide encryption, making it necessary to pair with IPsec for secure data transmission.