Network traffic refers to the flow of data across a computer network. It includes all the information sent and received by devices, such as computers, smartphones, and servers. This data can take various forms, including emails, web pages, and video streams, and is transmitted using different protocols, like TCP/IP. Monitoring network traffic is essential for maintaining network performance and security. By analyzing this traffic, network administrators can identify issues, such as congestion or unauthorized access. Tools like packet analyzers help visualize and manage the data flow, ensuring efficient communication within the network.