Open Shortest Path First (OSPF) is a widely used routing protocol in Internet Protocol (IP) networks. It helps routers communicate and share information about the best paths for data to travel across a network. OSPF uses a link-state routing algorithm, which means each router maintains a map of the network's topology and calculates the shortest path to each destination. OSPF is designed to be efficient and scalable, making it suitable for large networks. It organizes routers into areas to optimize routing and reduce overhead. By using OSPF, network administrators can ensure reliable and fast data transmission across interconnected devices.