A mesh network is a decentralized networking architecture that enables devices to communicate directly with one another without requiring a centralized control system. In such networks, each device (or node) passes information to other nodes, enhancing coverage and reliability. Mesh networks are ideal for scenarios where traditional networking may be impractical, such as remote areas or dynamic environments. They promote greater resilience, as the network can self-heal and dynamically adapt to changes, making them popular in applications like home automation and public Wi-Fi.