A relay node is a type of node in a blockchain network that helps facilitate communication between different nodes, especially those that may not be directly connected. Its primary role is to receive transactions or blocks from one node and forward them to others. This is crucial for keeping the network efficient and ensuring that transactions propagate quickly.Relay nodes are often used in systems that require high levels of decentralization. By allowing more nodes to participate without needing to keep a full copy of the blockchain, these nodes can reduce latency and improve the speed of data transfer across the network.Additionally, some relay nodes may provide added services, such as validating or relaying transactions, without storing the entire blockchain. This can benefit lightweight clients or mobile applications, making it easier for users to engage with the network without the need for heavy resources. Overall, relay nodes enhance the connectivity and overall performance of a blockchain, making it a more robust and scalable system.