Mesh architecture is a type of network design where each node connects directly to every other node, creating a highly interconnected network. There are two main types of Mesh Networks: Full Mesh, where every node is connected to every other node, and Partial Mesh, where only certain nodes are connected to each other. Mesh Topology Design involves strategic node placement, frequency selection, and backhaul design to optimize network performance. Routing Protocols in Mesh Networks can be Proactive, Reactive, or Hybrid, ensuring efficient data transmission.