Communication networks are systems that allow people and devices to share information with each other. These networks can be as simple as a group of friends chatting on their phones or as complex as the internet, which connects millions of computers worldwide. They use various technologies, such as Wi-Fi, cellular networks, and satellites, to transmit messages quickly and efficiently. In a communication network, data travels through different paths to reach its destination. For example, when you send a message to a friend, it may pass through several routers and servers before arriving. This interconnectedness enables seamless communication, making it easier for us to connect with others, whether for work or personal reasons.