A mesh network is a type of network topology where each device, or node, connects directly to multiple other nodes. This creates a web-like structure that allows data to be transmitted through various paths. If one node fails, the network can still function by rerouting data through other nodes, enhancing reliability and coverage. Mesh networks are often used in situations where traditional networks may struggle, such as in large buildings or outdoor areas. They are commonly found in smart home devices, community Wi-Fi projects, and IoT applications, providing seamless connectivity and improved performance.