Communication networks are systems that allow people and devices to share information. These networks can be as simple as a phone call between two friends or as complex as the internet, which connects millions of computers worldwide. They use various technologies, such as fiber optics, wireless signals, and satellites, to transmit data quickly and efficiently. In a communication network, different components work together to ensure messages reach their intended recipients. For example, routers direct data traffic, while servers store and manage information. Understanding how these networks function helps us appreciate the technology that keeps us connected in our daily lives.