Delay Tolerant Networking (DTN) is a communication approach designed for networks where traditional connectivity is unreliable or intermittent. It allows data to be stored temporarily and forwarded when a connection becomes available, making it suitable for environments like space missions or rural areas with limited infrastructure. DTN uses a store-and-forward mechanism, where messages are held by nodes until they can be transmitted. This method ensures that data can still be delivered even if there are long delays or disruptions in the network, enhancing communication in challenging conditions.