Opportunistic communication refers to the concept of utilizing any available communication opportunities in order to transmit data or messages, especially in scenarios where traditional network infrastructures may be unavailable or unreliable. This approach leverages the dynamic nature of wireless communications, allowing devices to opportunistically establish communication links with nearby devices or networks to exchange information. Opportunistic communication can be particularly useful in disaster response situations, remote or rural areas, or crowded urban environments where traditional communication networks may be overloaded or unavailable. Researchers in this area focus on developing algorithms, protocols, and systems that enable efficient and reliable opportunistic communication in various real-world scenarios.