What are the Catan road building rules and how do they impact gameplay in Settlers of Catan?

In Settlers of Catan, players can build roads to connect their settlements and expand their territory. The road building rules state that players can build roads by spending resources like brick and wood. Roads help players reach new locations, secure trade routes, and block opponents' expansion. They are crucial for gaining access to resources and establishing a strong presence on the board. Players must strategically plan their road placements to gain an advantage in the game.